diff --git a/CHANGELOG.md b/CHANGELOG.md
index b4df1e8a..866eec63 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,31 @@ GitHub are its section here (`tools/release.sh` copies them), so add to
 
 ## Unreleased
 
+- **The SM-24 Mono has a patch panel.** Its new PATCH page holds four
+  cords. Drag a jack from the dock onto a ringed knob (LPF CUT, HPF CUT,
+  PW, VCO2 PITCH, LVL, MG FREQ), or pick SRC and DEST on a cord row. The
+  jacks are FENV, AENV and AENV inverted, MG, MG PUL, S&H, NOISE, KBD, VEL,
+  PRESS, VCO1, VCO2 and VCA OUT. The cords run at audio rate, so VCO2 can
+  FM the cutoff and the output can feed back into the filter. A patch
+  with no cords sounds exactly as before. Five new patches show it off
+  (`patch-*`), with the demo `songs/ms20_patch_bay.py`.
+
+- **Squelch 33, an acid bassline synth.** A new mono machine built on the
+  HOT/WET filter the SM-24 Mono used to have: one SAW or SQR oscillator,
+  CUT, RES, ENV MOD, DECAY, ACCENT and SLIDE. Loud notes (the `!` in a
+  slabkit seq) are accented: louder, brighter, and a run of them climbs
+  higher with RES up. Overlapping notes slide. Presets: `classic-squelch`,
+  `square-bounce`, `wet-scream`, `round-line`; demo `songs/squelch_acid.py`.
+
+- **SM-24 Mono sounds like an MS-20.** Its LPF MODE gains **K35** and
+  **OTA**, the early and late MS-20 filters. Bass stays full at any PEAK,
+  the peak sits on CUT, and both the HPF and LPF resonate up to
+  self-oscillation. K35 is the default: grittier and lopsided when driven.
+  OTA is cleaner and sings. HOT and WET are still there for the acid
+  sound. New presets: `k35-scream`, `k35-round-bass`, `ota-singing-lead`.
+  A new SM-24 starts from a re-voiced init patch; saved songs and presets
+  keep their mode and sound as before.
+
 - **A harsh effects pack** (docs/43).
   - **Octaver** gives one and two octaves down the way analog divider
     pedals do, with a GLITCH knob to make it chatter, plus an
diff --git a/bench/golden/acid.txt b/bench/golden/acid.txt
new file mode 100644
index 00000000..e238c495
--- /dev/null
+++ b/bench/golden/acid.txt
@@ -0,0 +1,5 @@
+# bench goldens for acid: case sha256(f32 L ++ f32 R) [nonharm_db thd_db]
+notes 8bc59d45b766ad9007c4db1dbfcdd24b75f1c631ccc33814cc4ea2cc68ca9f61
+velocity b52ab388bda9c4e65b9ebf3b22a557d2771ad44628677afb3fd1ac0e190fccfd
+held 35a9aa5abc0a2babbc8df5521f5f2bd9614e162a47bd05b034765f7a33802a9c -76.1 5.5
+high 0cd64ed21d5ec2f2fb40eb5b4fbcf3d60c2435d8efaf6f3f7a79a694ac46c5b1 -48.3 1.5
diff --git a/bench/golden/ms20.txt b/bench/golden/ms20.txt
index b0bb8712..c568b5d9 100644
--- a/bench/golden/ms20.txt
+++ b/bench/golden/ms20.txt
@@ -1,5 +1,5 @@
 # bench goldens for ms20: case sha256(f32 L ++ f32 R) [nonharm_db thd_db]
-notes a07508ad06ee8723008c3675e0ba735e56105fb80a75298e29acc4df1704d188
-velocity ad9081885f858b343993a2bae2a8933f8152e0db0c9e95a3136cf678511c3859
-held 78fe628e416bc871081d2d1aaaeb60b0df256d812f9314579f7cddebdcfd6ae8 -23.3 -0.8
-high df662da24d2dd7cf90588facedc1e490e6250e35e1621b48657b76468bce0c68 -12.2 0.2
+notes cb771ada7c0d5dde3546729c14c16efa53ee4191994848fccd503cdbe36c67e3
+velocity 8e0cde2f8a794f10a1329f8f17f2ce2742c182977515a8e6ca3dda7acf5fd062
+held 90baac0913232f60198a2b81cae395d4d31eb7cb17e4620418b6cd5026087a15 -50.0 -5.2
+high 0de9e0cb902d5539ae2eff6c17697f52e0c239fc3122aab1a3a93a5db79f56d3 -30.1 -13.7
diff --git a/docs/14-ms20-machine.md b/docs/14-ms20-machine.md
index aa8430ec..2740f09a 100644
--- a/docs/14-ms20-machine.md
+++ b/docs/14-ms20-machine.md
@@ -10,6 +10,72 @@ Scope call: **no full semi-modular patch bay.** We implement the MS-20's
 *hardwired* routing (MG/EG→pitch, MG→cutoff, EG→cutoff/VCA, PWM, ring) with
 fixed intensity controls. A general routing matrix can come later.
 
+## K35 and OTA: the MS-20's own filters (2026-10-21)
+
+HOT and WET sound acid: a TB-303, not an MS-20. Their loop subtracts a
+clipped, 18 Hz high-passed copy of the lowpass from the input. That is the
+ladder structure (the 303 even has the high-pass in its loop). Measured
+with a numpy port of `ms20_lpf.fy` at CUT 500 Hz and a quiet input:
+
+- PEAK costs 16 dB of bass at its old default (0.7), and 22–25 dB at the
+  acid presets.
+- The peak sits 1.5–2.2 octaves above CUT.
+- The peak moves about 0.7 octave with input level, which is the rubbery
+  squelch.
+- The slope is −8 to −11 dB/oct.
+
+Stinchcombe's study of the MS-10/MS-20 filters
+([MS20_study.pdf](http://www.timstinchcombe.co.uk/synth/MS20_study.pdf))
+gives both hardware generations LP = 1/(s² + (a − k)s + 1) and
+HP = s²/(same). Here a = 2⅓ for the Korg35 Sallen-Key and 2 for the
+LM13600 OTA pair. So the DC gain doesn't depend on PEAK, the cutoff
+doesn't move, and the slope is 12 dB/oct.
+`kernels/04-filters/ms20_sk.fy` implements it as **MODE K35** and
+**MODE OTA**. HOT and WET stay as they were.
+
+```
+v      = x − (a + g)·s1 − s2
+bp-lin = (g·h·v + s1) / (1 − g·h·k)          h = 1/(1 + a·g + g²)
+fb     = vd·tanh(k·bp-lin / vd)              feedback diodes
+u      = vf·(tanh((drive·x + fb)/vf + fo) − tanh fo)
+TPT SVF with base damping a → hp, bp, lp
+```
+
+- **K35:** the diodes sit in the forward amplifier (vf 0.55), so loud
+  input distorts every frequency. A small offset (fo 0.12) makes the
+  resonance lopsided: the self-oscillation's 2nd harmonic is −37 to
+  −46 dB. Both are Stinchcombe §4–5.
+- **OTA:** the feedback diodes set the peak and the forward stage is soft
+  (vf 1.6), so the passband stays clean at normal DRIVE. The
+  self-oscillation is symmetric (2nd harmonic below −115 dB).
+- **Both filters resonate.** In these modes the HPF is the same core with
+  its own PEAK. The series HPF → LPF pair runs at 4× between `up4` and
+  `dec4`, and both cutoffs stop at 15 kHz (Korg's spec).
+- **PEAK taper:** k = a·(1 − u²) with u = 1 − (PEAK/2)/0.9, rising
+  linearly past 90%. This is a design choice, not a measured pot. A linear
+  pot repeats the 2026-09-26 OTA probe's "resonance invisible until the
+  top" (+1 dB at noon). This taper gives +6 dB at noon, and
+  self-oscillation from 1.82 of 2.
+
+Measured through the voice in the bench, with noise in (CUT 500 Hz, HPF
+1 kHz):
+
+| | K35 | OTA |
+|---|---|---|
+| bass at 60 Hz, PEAK 0 → 2, small signal | −0.2 … +0.4 dB | −0.1 … +0.2 dB |
+| peak position, PEAK ≥ 1.4 | within 0.02 oct of CUT | within 0.02 oct |
+| slope, 2 → 3 octaves past the corner | −10.7 … −11.8 dB/oct | −11.2 … −12.1 dB/oct |
+| peak at PEAK 1 (noon) | +6.4 dB | +8.1 dB |
+| peak, quiet → loud input, PEAK 1.75 | 23.5 → 8.3 dB | 32.5 → 15.3 dB |
+| HPF peak position / slope | within 0.04 oct / +11.5 … +12.6 | within 0.04 oct / +11.3 … +12.7 |
+| default notes, non-harmonic energy | −31 … −41 dB (HOT −18 … −22) | −31 … −42 dB |
+| cost, ReleaseFast, held note | ~2× HOT (≈ 350 vs 184 ns/smp) | same |
+
+K35 is the default for new instances. The init patch was re-voiced
+because CUT now means the corner: 1200 Hz, PEAK 1, ENV 2 octaves,
+filter decay 0.3 s, sustain 0.2. The acid pair is kept, both here and in
+`ms20_lpf.fy` for a future acid machine.
+
 ## LPF v3: the June probe's driven SVF, in fy (2026-09-27)
 
 The reference is `scratch/ms20_saw_filter_sweeps_f-hot.wav`, rendered by
@@ -285,3 +351,67 @@ hatch) is a good early proof.
 7. Panel: declare the strips (docs/15); custom ADSR cell.
 8. Global spilling (durable follow-up) to optionally collapse hot stages back
    inline; polyphony via a higher-order voice-pool machine (docs/15).
+
+## Squelch 33: the acid filter's own synth (2026-10-22)
+
+HOT/WET stayed in the SM-24 Mono, and the same kernel (`ms20_lpf.fy`,
+unchanged) now also drives `machines/acid`, a 303-style mono voice in
+`kernels/06-voices/acid_voice.fy`: one VCO (saw, or a square with a
+little of the ramp on its tops), the LPF at 4x, a decay-only MEG with
+ENV MOD (5 octaves at full), a VCA that decays over 3 s and closes in
+8 ms on key-up.
+
+- **Accent** is velocity over 0.8. An accented note runs a second MEG
+  at the 200 ms minimum decay; that envelope pushes the VCA directly
+  (x[1 + 1.2 ACC]) and feeds the accent RC (15 ms, 60 ms at full RES),
+  whose output adds 4 octaves x level to the cutoff. With RES up the RC
+  does not empty between notes, so accents in a row stack.
+- **Slide**: a note that overlaps the last (`ctx.legato`) glides on an
+  RC covering 3 time constants in SLIDE, and retriggers nothing.
+
+Measured (slabkit renders, A1 lines, 120-128 BPM):
+
+| | target | result |
+|---|---|---|
+| accent level | +4..6 dB | +4.3..5.3 dB at RES 0.3, +3.3..4.6 at 0.9 |
+| accent attack centroid | brighter | +40% at RES 0.3, +20% at 0.9 |
+| accent stacking, 3 in a row | climbs at high RES | +15% at RES 0.9, +5% at 0.3 |
+| fundamental loss, RES 0 -> 1 | the acid thinning | -13 dB HOT, -13.4 dB WET |
+| loudest partial, CUT 400 | 1.5-2 oct up | 654 Hz HOT, 785 Hz WET |
+| slide 60 ms | lands in ~60 ms | ~50-60 ms, no retrigger |
+| preset loudness on a line | -20 dB RMS +-1 | -20.0 .. -19.6 |
+| cost | | 233 ns/sample ReleaseFast |
+
+## The patch panel (2026-10-22)
+
+Four cords, evaluated every sample in the voice (`ms20-bay`,
+`ms20-cord-to` in `kernels/06-voices/ms20_voice_probe.fy`), declared to
+the panel the way Concoction's matrix is (docs/15 §Modulation): controls
+`ms20-c1-src` / `-dst` / `-amt` ... `ms20-c4-*`, `mod-source` jacks in the
+dock, `mod-dest` rings, the normalled routes (ENV and MG to LPF CUT, EG
+and MG to PITCH, MG to PW) as fixed rows, a PATCH page with the dock,
+the CORDS matrix display and a scope.
+
+- **Jacks** are an array in the voice state (`jk`), one per SRC option,
+  stored each sample and read by a runtime index, which sees the state
+  as the word found it: every source arrives one sample late. That is
+  what lets VCA OUT go back into the filter without a zero-delay loop.
+- **Destinations** and their range at AMT 1: PITCH and VCO2 +-2
+  octaves, PW +-0.45, HPF CUT and LPF CUT +-5 octaves (KBD at AMT 0.2
+  tracks the keyboard 1:1), VCA gain +-1, MG FREQ +-4 octaves, FLT IN the
+  source as audio at the mixer's level, ahead of both filters.
+- **Free when empty.** The bay sits behind `bay-on` (a cord with SRC and
+  DEST set), the per-sample HPF coefficients behind `bay-hpf`; both are
+  versioned `ifte`s, and every unpatched path adds exact zeros, so all
+  goldens stay bit-exact. VCO1's wave became a select so the voice fits
+  fy's 32 versioned bodies (VCO2 wave 4 x MODE 2 x 2 x 2); past that the
+  bay if-converted and cost 609 ns/sample unpatched.
+- Cost, ReleaseFast: 413 ns/sample unpatched, 470 with a cord.
+
+Measured on a held C3 (K35, CUT 600, PEAK 1, ENV 0): MG -> LPF CUT 0.3
+triples the centroid's swing (66 -> 190 Hz); MG -> PITCH 0.05 gives
+vibrato; AENV -> VCA -0.5 takes 6 dB off; VCO2 a fifth up -> LPF CUT
+0.3 doubles the centroid (418 -> 866 Hz) at audio rate; VCA OUT -> FLT IN
+0.8 stays bounded (peak -6.9 dBFS). The `patch-*` presets sit at -21 to
+-22 dB RMS on a bassline (the vowel patch, a band-pass, -22 two octaves
+up).
diff --git a/docs/20-machine-reference.md b/docs/20-machine-reference.md
index 9fe5068d..6e8f1aee 100644
--- a/docs/20-machine-reference.md
+++ b/docs/20-machine-reference.md
@@ -8,6 +8,7 @@ project or preset stores (docs/19): real units for knobs, the option
 
 | id | name | kind | voices | prefix |
 |---|---|---|---|---|
+| [`acid`](#acid) | Squelch 33 | instrument | mono | `—` |
 | [`bass`](#bass) | Fretwire | instrument | 4 | `bs-` |
 | [`concoction`](#concoction) | Concoction | instrument | 8 | `cn-` |
 | [`cream`](#cream) | Mog Passenger | instrument | mono | `cr-` |
@@ -51,6 +52,31 @@ project or preset stores (docs/19): real units for knobs, the option
 | [`verb2`](#verb2) | Verb | effect | — | `verb-` |
 | [`wob2`](#wob2) | Wobble | effect | — | `wob-` |
 
+## acid
+
+**Squelch 33**, instrument, mono.
+
+| param | section | label | range | default | notes |
+|---|---|---|---|---|---|
+| `tune` | VCO | TUNE | -12 … 12 | 0 | linear |
+| `wave` | VCO | WAVE | 0 SAW / 1 SQR | 0 | switch |
+| `cutoff` | VCF | CUT | 30 … 8000 | 260 | exp |
+| `resonance` | VCF | RES | 0 … 1 | 0.6 | linear |
+| `env-mod` | VCF | ENV | 0 … 1 | 0.5 | linear |
+| `decay` | VCF | DEC | 0.2 … 2 | 0.5 | exp |
+| `accent` | PLAY | ACC | 0 … 1 | 0.7 | linear |
+| `slide` | PLAY | SLIDE | 0.02 … 0.3 | 0.06 | exp |
+| `drive` | DRIVE | DRV | 0.25 … 4 | 1 | exp |
+| `mode` | DRIVE | MODE | 0 HOT / 1 WET | 0 | switch |
+| `level` | OUT | LVL | 0 … 1 | 0.68 | pow |
+
+Presets:
+
+- `classic-squelch` — Saw, RES high, a medium sweep: accents bark and stack
+- `round-line` — Low RES and little sweep: a round bassline under a mix
+- `square-bounce` — Square, short decay, moderate RES: a hollow rubbery line
+- `wet-scream` — WET mode driven, RES near the top: screaming accents
+
 ## bass
 
 **Fretwire**, instrument, 4 voices.
@@ -964,11 +990,11 @@ Presets:
 | `noise-level` | MIX | NOISE | 0 … 1 | 0 | pow |
 | `hpf-cutoff` | HPF | CUT | 20 … 15000 | 20 | exp |
 | `hpf-resonance` | HPF | PEAK | 0 … 2 | 0 | linear |
-| `cutoff` | LPF | CUT | 20 … 18000 | 700 | exp |
-| `resonance` | LPF | PEAK | 0 … 2 | 0.7 | linear |
+| `cutoff` | LPF | CUT | 20 … 18000 | 1200 | exp |
+| `resonance` | LPF | PEAK | 0 … 2 | 1 | linear |
 | `drive` | LPF | DRV | 0.25 … 4 | 1 | exp |
-| `lpf-mode` | LPF | MODE | 0 HOT / 1 WET | 0 | switch |
-| `env-amount` | LPF | ENV | 0 … 8 | 4.8 | linear |
+| `lpf-mode` | LPF | MODE | 0 HOT / 1 WET / 2 K35 / 3 OTA | 2 | switch |
+| `env-amount` | LPF | ENV | 0 … 8 | 2 | linear |
 | `level` | VCA | LVL | 0 … 1 | 0.44 | pow |
 | `age` | VCA | AGE | 0 … 1 | 0.4 | linear |
 | `amp-hold` | AMP ENV | HOLD | 0 … 20 | 0 | pow |
@@ -978,8 +1004,8 @@ Presets:
 | `amp-release` | AMP ENV | REL | 0.01 … 10 | 0.13 | exp |
 | `filter-delay` | FLT ENV | DLY | 0 … 10 | 0 | pow |
 | `filter-attack` | FLT ENV | ATK | 0.001 … 10 | 0.014 | exp |
-| `filter-decay` | FLT ENV | DEC | 0.01 … 10 | 0.14 | exp |
-| `filter-sustain` | FLT ENV | SUS | 0 … 1 | 0.18 | linear |
+| `filter-decay` | FLT ENV | DEC | 0.01 … 10 | 0.3 | exp |
+| `filter-sustain` | FLT ENV | SUS | 0 … 1 | 0.2 | linear |
 | `filter-release` | FLT ENV | REL | 0.01 … 10 | 0.11 | exp |
 | `mg-freq` | MG | FREQ | 0.1 … 20 | 3 | exp |
 | `mg-wave` | MG | WAVE | 0 … 1 | 0.5 | linear |
@@ -988,16 +1014,36 @@ Presets:
 | `mg-cutoff` | MOD | MG>CUT | 0 … 4 | 0 | pow |
 | `eg-pitch` | MOD | EG>PIT | 0 … 1 | 0 | pow |
 | `portamento` | MOD | PORTA | 0 … 10 | 0 | pow |
+| `ms20-c1-src` | CORD 1 | SRC | 0 OFF / 1 FENV / 2 AENV / 3 AENV- / 4 MG / 5 MG PUL / 6 S&H / 7 NOISE / 8 KBD / 9 VEL / 10 PRESS / 11 VCO1 / 12 VCO2 / 13 VCA OUT | 0 | switch |
+| `ms20-c1-dst` | CORD 1 | DEST | 0 OFF / 1 PITCH / 2 VCO2 / 3 PW / 4 HPF CUT / 5 LPF CUT / 6 VCA / 7 MG FREQ / 8 FLT IN | 0 | switch |
+| `ms20-c1-amt` | CORD 1 | AMT | -1 … 1 | 0 | linear |
+| `ms20-c2-src` | CORD 2 | SRC | 0 OFF / 1 FENV / 2 AENV / 3 AENV- / 4 MG / 5 MG PUL / 6 S&H / 7 NOISE / 8 KBD / 9 VEL / 10 PRESS / 11 VCO1 / 12 VCO2 / 13 VCA OUT | 0 | switch |
+| `ms20-c2-dst` | CORD 2 | DEST | 0 OFF / 1 PITCH / 2 VCO2 / 3 PW / 4 HPF CUT / 5 LPF CUT / 6 VCA / 7 MG FREQ / 8 FLT IN | 0 | switch |
+| `ms20-c2-amt` | CORD 2 | AMT | -1 … 1 | 0 | linear |
+| `ms20-c3-src` | CORD 3 | SRC | 0 OFF / 1 FENV / 2 AENV / 3 AENV- / 4 MG / 5 MG PUL / 6 S&H / 7 NOISE / 8 KBD / 9 VEL / 10 PRESS / 11 VCO1 / 12 VCO2 / 13 VCA OUT | 0 | switch |
+| `ms20-c3-dst` | CORD 3 | DEST | 0 OFF / 1 PITCH / 2 VCO2 / 3 PW / 4 HPF CUT / 5 LPF CUT / 6 VCA / 7 MG FREQ / 8 FLT IN | 0 | switch |
+| `ms20-c3-amt` | CORD 3 | AMT | -1 … 1 | 0 | linear |
+| `ms20-c4-src` | CORD 4 | SRC | 0 OFF / 1 FENV / 2 AENV / 3 AENV- / 4 MG / 5 MG PUL / 6 S&H / 7 NOISE / 8 KBD / 9 VEL / 10 PRESS / 11 VCO1 / 12 VCO2 / 13 VCA OUT | 0 | switch |
+| `ms20-c4-dst` | CORD 4 | DEST | 0 OFF / 1 PITCH / 2 VCO2 / 3 PW / 4 HPF CUT / 5 LPF CUT / 6 VCA / 7 MG FREQ / 8 FLT IN | 0 | switch |
+| `ms20-c4-amt` | CORD 4 | AMT | -1 … 1 | 0 | linear |
 
 Presets:
 
 - `acid-bass` — Squelchy resonant bass — play low, ride LPF CUT
 - `aggressive-fill-lead` — Short aggressive lead / fill
 - `buzz-lead` — Bright buzzy lead with a touch of MG wobble
+- `k35-round-bass` — K35 bass: full low end, a gentle peak, short EG2 sweep
+- `k35-scream` — K35 filters both peaked and driven: the early MS-20 scream
 - `mild-acid-bass` — Mild acid, not techno
 - `minimal-8th-bass` — Minimal 8th-note spoken-verse bass
 - `nasal-sneer-lead` — Nasal sneering mono lead
 - `octave-night-bass` — Faster octave night-drive bass
+- `ota-singing-lead` — OTA LPF, peak high and clean: the later MS-20, symmetric and singing
+- `patch-feedback-growl` — VCA OUT back into FLT IN: the OTA growls and sings as the note swells
+- `patch-fm-metal-bass` — VCO2 a fifth up into LPF CUT at audio rate: a metallic, clangy bass
+- `patch-sh-bubbles` — S&H on LPF CUT, clocked by the MG: random bubbling under a peaked K35
+- `patch-tracking-lead` — KBD on LPF CUT for full tracking, MG on PITCH for a slow vibrato, PRESS opens it
+- `patch-vowel-sweep` — FENV on HPF CUT with both filters peaked: a talking band-pass sweep
 - `portamento-highway-lead` — Smooth portamento highway lead
 - `resonant-funk-bass` — Resonant funky bass with filter bite
 - `rising-filter-fx` — Overdriven rising-filter FX sweep
@@ -1620,7 +1666,7 @@ Presets:
 
 - `parallel-squash` — Parallel compression: the dry signal beside a crushed, saturated copy. AMOUNT brings the copy up under it.
 - `harsh/bit-guitar` — Lows cut, crushed to 8 bits at 11 kHz, into a clean amp: aliased, zippy guitar.
-- `harsh/cross-bass` — Justice-style bass: a clean sub lane, and a dirty lane cut below 250 Hz, crushed to 12 bits, overdriven, through a Brit 4x12, slammed by a FET and taped.
+- `harsh/cross-bass` — Justice-style bass: a clean sub lane, and a dirty lane cut below 250 Hz, crushed to 12 bits, overdriven, through a bright Brit 4x12 and slammed by a FET.
 - `harsh/four-slot` — Distructor's layout: distortion, filter, chorus and amp in four slots, each slot's mix on a knob.
 - `harsh/gated-fuzz` — A starved fuzz into a fast gate: notes sputter and cut off dead.
 - `harsh/kodiak` — Big and gnarly: a clean low-passed sub lane under a lane of octave-down, dynamic folding, RAT and OTT. SIZE is the sub, GNARL the dirt.
diff --git a/kernels/04-filters/ms20_sk.fy b/kernels/04-filters/ms20_sk.fy
new file mode 100644
index 00000000..c12ee5b5
--- /dev/null
+++ b/kernels/04-filters/ms20_sk.fy
@@ -0,0 +1,116 @@
+( ms20_sk.fy - the MS-20's own filters: K35 and OTA, low-pass and high-pass.
+
+  Stinchcombe's study of the MS-10/MS-20 filters [timstinchcombe.co.uk/
+  synth/MS20_study.pdf] gives both generations the same linear response,
+
+    LP = 1 / [s^2 + [a - k] s + 1]      HP = s^2 / [same]
+
+  with a = 2 1/3 for the Korg35 Sallen-Key [early units] and a = 2 for the
+  later LM13600 OTA pair, k the resonance loop gain.  The DC gain stays 1
+  whatever the resonance and the poles stay on the unit circle: PEAK
+  sharpens the corner without moving it or thinning the bass.  That is the
+  difference from the HOT/WET pair [ms20_lpf.fy], whose ladder-style
+  negative feedback gives the 303 squelch.
+
+  Here: a TPT state-variable core with base damping a, and the resonance
+  as positive band-pass feedback k bp into the input, one zero-delay step
+  per substep.  The feedback is predicted linearly, then clipped:
+
+    v      = x - [a + g] s1 - s2
+    bp-lin = [g h v + s1] / [1 - g h k]        h = 1 / [1 + a g + g^2]
+    fb     = vd tanh[k bp-lin / vd]            the feedback diodes
+    u      = vf [tanh[[drive x + fb] / vf + fo] - tanh[fo]]
+    hp     = [u - [a + g] s1 - s2] h ...       then bp, lp as usual
+
+  Where the two generations differ [Stinchcombe §4, §5]:
+  - K35: the diodes sit in the forward amplifier [x58 gain, one diode
+    drop], so a loud signal distorts at every frequency, and the signal
+    tilts the Korg35's transistor currents, making the resonance stronger
+    on one half-wave.  Small vf, a fo offset.
+  - OTA: three diodes per side in the feedback amplifier [x4], so only the
+    corner distorts and the response is symmetric.  vf large [the OTA
+    input pair, soft], fo 0, and the feedback diodes vd set the peak.
+
+  k past a self-oscillates; vd bounds it.  Run at 4x [the voice's
+  up4/dec4].  Coefficients come once per block from ms20-sk-set; g per
+  sample from the cutoff. )
+
+include "../00-primitives/math.fy"   ( tanh-fast )
+
+ustruct: Ms20Sk
+  f64 s1
+  f64 s2
+;
+
+ustruct: Ms20SkProfile
+  f64 a        ( base damping: 2 OTA, 7/3 K35 )
+  f64 k-lp     ( LPF loop gain, from PEAK )
+  f64 k-hp     ( HPF loop gain, from its PEAK )
+  f64 drive    ( input gain )
+  f64 vf       ( forward clip level )
+  f64 fo       ( forward clip offset: K35 asymmetry )
+  f64 fto      ( tanh[fo], subtracted so 0 in is 0 out )
+  f64 vd       ( feedback diode level )
+  f64 g-hp     ( HPF g at the 4x rate )
+  f64 out-g    ( output gain, to the HOT mode's level )
+;
+
+( p a -- k : PEAK [0..1 of its travel] to loop gain.  A linear pot would
+  give k = a p / 0.9: Q = 1 / [a - k] stays near 1 until the last third,
+  the 'resonance invisible until the top' of the September OTA probe.  The
+  taper here is a design choice, not a measured pot: k = a [1 - u^2] with
+  u = 1 - p / 0.9, so the peak is +6 dB by noon and climbs steadily; past
+  90%, where u < 0, k = a [1 - u] keeps rising linearly into
+  self-oscillation, to 1.11 a at the end. )
+dsp: ms20-sk-k | p a -- k |
+  1.0  p 0.0 1.0 fclamp 0.9 f/  f- | u |
+  1.0  u  u 0.0 1.0 u fsel-lt  f*  f-  a f*
+;
+
+( pr drive res hres mode hpf-hz osr -- : one block's constants.  mode 2
+  K35, 3 OTA; res and hres are the PEAK knobs, 0..2. )
+dsp: ms20-sk-set | pr:Ms20SkProfile drive res hres mode hz osr -- |
+  mode 2.5  2.3333333333333335 2.0  fsel-lt | a |
+  a -> pr.a
+  res 0.5 f*  a ms20-sk-k -> pr.k-lp
+  hres 0.5 f*  a ms20-sk-k -> pr.k-hp
+  mode 2.5  0.9 0.6  fsel-lt  drive f* -> pr.drive
+  mode 2.5  0.55 1.6  fsel-lt -> pr.vf
+  mode 2.5  0.12 0.0  fsel-lt | fo |
+  fo -> pr.fo
+  fo tanh-fast -> pr.fto
+  mode 2.5  0.45 0.5  fsel-lt -> pr.vd
+  hz 20.0 15000.0 fclamp 3.141592653589793 f* osr f/ tan-warp -> pr.g-hp
+  mode 2.5  1.7 1.75  fsel-lt -> pr.out-g
+;
+
+( f pr x g k dr -- lp hp : one zero-delay substep of the core; dr is the
+  input gain [DRIVE for the first filter of the pair, 1 for the second]. )
+dsp: ms20-sk-core | f:Ms20Sk pr:Ms20SkProfile x g k dr -- lp hp |
+  x dr f* | xd |
+  f.s1 | s1 |
+  f.s2 | s2 |
+  pr.a | a |
+  1.0  1.0 a g f* f+ g g f* f+  f/ | h |
+  a g f+ s1 f* s2 f+ | lin |
+  g h f* | gh |
+  gh  xd lin f-  f*  s1 f+   1.0 gh k f* f-  f/ | bpl |
+  k bpl f*  pr.vd f/  tanh-fast  pr.vd f* | fb |
+  xd fb f+  pr.vf f/  pr.fo f+  tanh-fast  pr.fto f-  pr.vf f* | u |
+  u lin f-  h f* | hp |
+  g hp f* | ghp |
+  ghp s1 f+ | bp |
+  g bp f* | gbp |
+  gbp s2 f+ | lp |
+  ghp bp f+ -> f.s1
+  gbp lp f+ -> f.s2
+  lp hp
+;
+
+( hf lf pr x g -- y : one 4x substep of the MS-20's series pair, HPF into
+  LPF; g is the LPF's. )
+dsp: ms20-sk-step | hf:Ms20Sk lf:Ms20Sk pr:Ms20SkProfile x g -- y |
+  hf pr x pr.g-hp pr.k-hp pr.drive ms20-sk-core | hlp hhp |
+  lf pr hhp g pr.k-lp 1.0 ms20-sk-core | llp lhp |
+  llp pr.out-g f*
+;
diff --git a/kernels/06-voices/acid_voice.fy b/kernels/06-voices/acid_voice.fy
new file mode 100644
index 00000000..edbc74cd
--- /dev/null
+++ b/kernels/06-voices/acid_voice.fy
@@ -0,0 +1,147 @@
+( acid_voice.fy - a TB-303-style mono bassline voice around the HOT/WET
+  lowpass [ms20_lpf.fy].
+
+  That filter was the SM-24 Mono's first LPF and sounded like a 303, not
+  an MS-20 [docs/14]: its clipped lowpass is subtracted at a hot input,
+  so PEAK thins the bass 16-25 dB, and the peak rides 1.5-2 octaves over
+  CUT and moves with the level.  Here it gets the voice it was asking
+  for.  The kernel is used as is.
+
+    VCO [saw, or the square shaped from it] -> LPF [4x] -> VCA -> DC block
+
+  The 303's voicing:
+  - one VCO, SAW or SQR.  The square keeps a little of the saw's ramp on
+    its tops, like the transistor shaper that makes it, and sits at the
+    saw's loudness.
+  - the MEG is decay only [sustain 0], from a 3 ms attack, and keeps
+    falling after the key is up.  ENV MOD scales it onto the cutoff.
+  - an accented note [velocity over 0.8, the `!` of a slabkit seq] runs a
+    second MEG with the decay at its 200 ms minimum, and sends the
+    envelope through the accent RC into the cutoff and the VCA.  The RC
+    is slower with RES up, so accents in a row stack the sweep higher:
+    the 'wow'.
+  - a note that overlaps the last one slides to its pitch [ctx.legato]
+    on an RC, without retriggering anything.
+  - the VCA decays over 3 s while held and closes in 8 ms on key-up. )
+
+include "../00-primitives/ctx.fy"  ( kernel ABI: Ctx, Io )
+include "../00-primitives/math.fy"
+include "../00-primitives/oversample.fy"
+include "../01-oscillators/primitives/phase.fy"
+include "../01-oscillators/primitives/blep.fy"
+include "../01-oscillators/primitives/vco.fy"
+include "../02-shapers/rational.fy"   ( tanh-rational )
+include "../03-envelopes/primitives/env_rc.fy"
+include "../04-filters/coeffs.fy"   ( svf-g )
+include "../04-filters/ms20_lpf.fy"
+
+ustruct: AcidState
+  f64 phase
+  f64 oct          ( current pitch, log2 Hz: slides toward target-oct )
+  f64 target-oct
+  f64 acc          ( this note's accent, 0..ACCENT )
+  f64 accf         ( 1 when the note was triggered accented )
+  f64 acc-cv       ( the accent RC )
+  f64 dc-prev-x
+  f64 dc-prev-y
+  EnvRc meg  EnvRc mega  EnvRc vca
+  Ms20Lpf lpf
+  Up4 up
+  Dec4 dec
+;
+
+ustruct: AcidParams
+  f64 tune         ( semitones )
+  f64 wave         ( 0 SAW 1 SQR - switch )
+  f64 cutoff       ( base cutoff Hz )
+  f64 resonance    ( RES 0..1 )
+  f64 env-mod      ( ENV MOD 0..1 )
+  f64 decay        ( MEG decay, seconds )
+  f64 accent       ( ACCENT 0..1 )
+  f64 slide        ( slide time, seconds )
+  f64 drive        ( LPF input drive, x the mode's own )
+  f64 mode         ( 0 HOT 1 WET - switch )
+  f64 level
+  ( derived per block by acid-block-prepare )
+  f64 inv-sample-rate
+  f64 osr
+  EnvRcCoefs meg-co
+  EnvRcCoefs mega-co
+  EnvRcCoefs vca-co
+  Ms20LpfProfile lpf-pr
+  f64 slide-c      ( slide one-pole, per sample )
+  f64 tune-ratio
+  f64 env-oct      ( ENV MOD in octaves )
+  f64 acc-c        ( accent RC, per sample )
+;
+
+( ctx state params -- : a note.  An overlapping note slides and keeps
+  the envelopes; any other jumps to its pitch and retriggers them. )
+dsp: acid-note-on | ctx:Ctx state:AcidState params:AcidParams |
+  ctx.hz 1.0 fmax log2 | o |
+  o -> state.target-oct
+  ctx.legato 0.5  o state.oct  fsel-lt -> state.oct
+  ctx.vel 0.8 f- 6.666666666666667 f* 0.0 1.0 fclamp | av |
+  av params.accent f* -> state.acc
+  ctx.legato 0.5  0.0 av 1.0 0.0 fsel-lt  state.accf  fsel-lt -> state.accf
+  state.meg& params.meg-co& ctx.legato env-rc-trigger
+  state.mega& params.mega-co& ctx.legato env-rc-trigger
+  state.vca& params.vca-co& ctx.legato env-rc-trigger
+;
+
+( ctx state params -- : per-note expression [docs/22]: a bend moves the
+  pitch directly. )
+dsp: acid-note-expr | ctx:Ctx state:AcidState params:AcidParams |
+  ctx.hz 1.0 fmax log2 | o |
+  o -> state.target-oct
+  o -> state.oct
+;
+
+( ctx state params -- : key up.  The MEGs release at their decay rate,
+  so they fall on as if still held; the VCA closes. )
+dsp: acid-note-off | ctx state:AcidState params:AcidParams |
+  state.meg& params.meg-co& env-rc-release
+  state.mega& params.mega-co& env-rc-release
+  state.vca& params.vca-co& env-rc-release
+;
+
+( One LPF substep. )
+dsp: acid-lpf-sub | state:AcidState params:AcidParams x g -- y |
+  state.lpf&  params.lpf-pr&  x g  ms20-lpf-step
+;
+
+( io ctx state params -- : one sample. )
+dsp: k-acid-voice-sample | io ctx state:AcidState params:AcidParams -- |
+  state.oct  state.target-oct state.oct f-  params.slide-c f*  f+ | oct |
+  oct -> state.oct
+  oct exp2  params.tune-ratio f*  params.inv-sample-rate f* | dt |
+  state.phase | ph |
+  ph dt phase-advance01 -> state.phase
+  ph dt 0.1 vco-saw fneg | saw |
+  params.wave 0.5 f<
+  [ saw ]
+  [ ph dt 0.5 pulse-polyblep  saw 0.15 f*  f+  0.72 f* ]  ifte  0.62 f* | x |
+  ( the MEG: the accented one for an accented note )
+  state.meg& params.meg-co& env-rc-step | fn |
+  state.mega& params.mega-co& env-rc-step | fa |
+  fa fn f-  state.accf f*  fn f+ | fenv |
+  state.acc-cv  fa state.acc f*  state.acc-cv f-  params.acc-c f*  f+ | acv |
+  acv -> state.acc-cv
+  state.vca& params.vca-co& env-rc-step | aenv |
+  fenv params.env-oct f*  acv 4.0 f*  f+  exp2  params.cutoff f* | hz |
+  hz params.osr svf-g | g |
+  state.up& x up4 | x0 x1 x2 x3 |
+  state.dec&
+    state params x0 g acid-lpf-sub
+    state params x1 g acid-lpf-sub
+    state params x2 g acid-lpf-sub
+    state params x3 g acid-lpf-sub
+  dec4 | y |
+  ( VCA: the envelope, the accent's push, the level; a ~20 Hz DC block )
+  1.0  fa state.acc f* 1.2 f*  f+ | ag |
+  y aenv f*  ag f*  params.level f*  1.78 f* | v |
+  v state.dc-prev-x f-  state.dc-prev-y 0.9974 f*  f+ | o |
+  v -> state.dc-prev-x
+  o -> state.dc-prev-y
+  o io f!64
+;
diff --git a/kernels/06-voices/ms20_voice_probe.fy b/kernels/06-voices/ms20_voice_probe.fy
index 7a63af57..4a970ff1 100644
--- a/kernels/06-voices/ms20_voice_probe.fy
+++ b/kernels/06-voices/ms20_voice_probe.fy
@@ -45,6 +45,7 @@ include "../03-envelopes/primitives/env_rc.fy"
 include "../04-filters/coeffs.fy"   ( svf-g, svf-damping )
 include "../04-filters/ms20_hpf.fy"
 include "../04-filters/ms20_lpf.fy"
+include "../04-filters/ms20_sk.fy"
 
 ustruct: Ms20VoiceState
   f64 phase1
@@ -65,6 +66,13 @@ ustruct: Ms20VoiceState
   Up4 up
   Drift dr1  Drift dr2  Drift drc  Drift drv
   f64 dro-x  f64 dro-y   ( the mix's coupling cap )
+  Ms20Sk sk-hp  Ms20Sk sk-lp   ( K35/OTA modes: the HPF and LPF, at 4x )
+  ( the patch panel [ms20-cord-to] )
+  f64 jk 14            ( the jacks, by SRC option: written each sample, read the next )
+  f64 sh               ( S&H: noise held at each MG cycle )
+  f64 press            ( per-note pressure )
+  f64 mg-oct           ( MG FREQ from the cords, octaves, a sample late )
+  f64 cut-hz  f64 hpf-hz  f64 pw-v  f64 vca-v  f64 mg-hz  f64 det-v   ( what the cords make of the knobs )
 ;
 
 ustruct: Ms20VoiceParams
@@ -76,7 +84,7 @@ ustruct: Ms20VoiceParams
   f64 resonance        ( LPF resonance 0..2 )
   f64 drive            ( LPF input drive, x the mode's own )
   f64 level
-  f64 lpf-mode         ( 0 HOT 1 WET - switch )
+  f64 lpf-mode         ( 0 HOT 1 WET [the acid pair, ms20_lpf.fy], 2 K35 3 OTA [ms20_sk.fy] - switch )
   f64 amp-attack
   f64 amp-decay
   f64 amp-sustain
@@ -106,10 +114,14 @@ ustruct: Ms20VoiceParams
   f64 filter-delay     ( filter EG: key-down -> attack, seconds [EG1 DELAY] )
   f64 amp-hold         ( amp EG: key-up -> release, seconds [EG2 HOLD] )
   f64 age-amt          ( AGE 0..1: the analog layer )
+  f64 p-src 4          ( the four cords: SRC, DEST and AMT options [ms20.fy] )
+  f64 p-dst 4
+  f64 p-amt 4
   ( derived per block by ms20-block-prepare )
   EnvRcCoefs amp-co
   EnvRcCoefs flt-co
   Ms20LpfProfile lpf-pr
+  Ms20SkProfile sk-pr
   f64 detune-ratio     ( 2^[detune/12] )
   f64 hpf-f            ( HPF Chamberlin f )
   f64 hpf-q            ( HPF damping )
@@ -118,6 +130,8 @@ ustruct: Ms20VoiceParams
   f64 drift-c  f64 cut-drift-c
   f64 bleed
   f64 dro-a
+  f64 bay-on           ( 1 when a cord is in )
+  f64 bay-hpf          ( 1 when a cord reaches HPF CUT )
 ;
 
 ( ctx state params -- : a note.  A fresh note gates both envelopes from
@@ -140,6 +154,7 @@ dsp: ms20-voice-note-on
   state.phase2 0.0 f=  ctx.phase 2.618 f* ffrac  state.phase2  select -> state.phase2
   state.amp-env& params.amp-co& ctx.legato env-rc-trigger
   state.flt-env& params.flt-co& ctx.legato env-rc-trigger
+  ctx.pressure -> state.press
 ;
 
 ( ctx state params -- : per-note expression [docs/22]: the bend is
@@ -149,6 +164,7 @@ dsp: ms20-voice-note-expr
   ctx.hz 1.0 fmax log2 | o |
   o -> state.target-oct
   o -> state.oct
+  ctx.pressure -> state.press
 ;
 
 ( ctx state params -- : release both envelopes from where they are. )
@@ -158,8 +174,7 @@ dsp: ms20-voice-note-off
   state.flt-env& params.flt-co& env-rc-release
 ;
 
-( VCO1 with waveform select (tri/saw/pulse), octave scaled, phase advanced.
-  WAVE is a switch: only its wave is computed. pmod is the frequency
+( VCO1 with waveform select (tri/saw/pulse), octave scaled, phase advanced. pmod is the frequency
   multiplier from MG/EG routing, pw the effective pulse width. )
 dsp: v-vco1 | state:Ms20VoiceState params:Ms20VoiceParams pmod pw -- y |
   state.phase1
@@ -169,11 +184,12 @@ dsp: v-vco1 | state:Ms20VoiceState params:Ms20VoiceParams pmod pw -- y |
   | phase dt |
   phase dt phase-advance01
   -> state.phase1
-  params.vco1-wave 0.5 f<
-  [ phase tri-raw ]
-  [ params.vco1-wave 1.5 f<
-    [ phase dt params.curve1 vco-saw fneg ]
-    [ phase dt pw pulse-polyblep ]  ifte ]  ifte
+  ( a select, not an ifte: the three waves are cheap, and the versioned
+    bodies [32 at most] go to VCO2's waves, the filter MODE and the
+    patch panel )
+  params.vco1-wave 0.5 f<  phase tri-raw
+    params.vco1-wave 1.5 f<  phase dt params.curve1 vco-saw fneg
+      phase dt pw pulse-polyblep  select  select
 ;
 
 ( VCO2 with waveform select (saw/square/pulse/ring), detuned and
@@ -204,9 +220,9 @@ dsp: v-noise-raw | state:Ms20VoiceState -- y |
 ;
 
 ( VCO1*lvl + VCO2*lvl + noise*lvl at 0.62 per unit: clean. )
-dsp: v-osc-mix | state params:Ms20VoiceParams pmod1 pmod2 pw -- y |
-  state params pmod1 pw v-vco1  params.saw-level f*
-  state params pmod2 pw v-vco2  params.pulse-level f*  f+
+dsp: v-osc-mix | state:Ms20VoiceState params:Ms20VoiceParams pmod1 pmod2 pw -- y |
+  state params pmod1 pw v-vco1  dup state.jk& 11.0 f!i  params.saw-level f*
+  state params pmod2 pw v-vco2  dup state.jk& 12.0 f!i  params.pulse-level f*  f+
   state v-noise-raw  params.noise-level f*  f+
   0.62 f*
 ;
@@ -232,6 +248,43 @@ dsp: v-lpf-sub | state:Ms20VoiceState params:Ms20VoiceParams x g -- y |
   state.lpf&  params.lpf-pr&  x g  ms20-lpf-step
 ;
 
+( One K35/OTA substep: the series HPF -> LPF pair. )
+dsp: v-sk-sub | state:Ms20VoiceState params:Ms20VoiceParams x g -- y |
+  state.sk-hp&  state.sk-lp&  params.sk-pr&  x g  ms20-sk-step
+;
+
+( g pr -- : a cord on HPF CUT sets the K35/OTA HPF's g per sample. )
+dsp: ms20-sk-set-ghp | g pr:Ms20SkProfile -- |  g -> pr.g-hp ;
+
+( state params k -- s : the patch panel's pull on DEST option k: every
+  cord plugged into it, its jack x AMT.  The jack holds its source's
+  value from the sample before [a runtime-indexed load reads the state
+  as the word found it], so a cord can loop the VCA back into the
+  filter. )
+dsp: ms20-cord-to | state:Ms20VoiceState params:Ms20VoiceParams k -- s |
+  0.0 0.0 4 [ | i acc |
+    i 1.0 f+
+    acc
+      params.p-dst& i f@i k f=
+      state.jk& params.p-src& i f@i f@i  params.p-amt& i f@i f*
+      0.0 select
+    f+ ] times nip
+;
+
+( state params -- dests : the eight destinations, in their units:
+  PITCH and VCO2 +-2 octaves, PW +-0.45, the cutoffs +-5 octaves, VCA
+  gain +-1, MG FREQ +-4 octaves, FLT IN the signal at the mixer's level. )
+dsp: ms20-bay | state:Ms20VoiceState params:Ms20VoiceParams -- dpit d2 dpw dhc dlc dvca dmg din |
+  state params 1.0 ms20-cord-to 2.0 f*
+  state params 2.0 ms20-cord-to 2.0 f*
+  state params 3.0 ms20-cord-to 0.45 f*
+  state params 4.0 ms20-cord-to 5.0 f*
+  state params 5.0 ms20-cord-to 5.0 f*
+  state params 6.0 ms20-cord-to
+  state params 7.0 ms20-cord-to 4.0 f*
+  state params 8.0 ms20-cord-to 0.62 f*
+;
+
 ( io ctx state params -- : render one mono voice sample. )
 dsp: k-ms20-voice-sample | io ctx state:Ms20VoiceState params:Ms20VoiceParams -- |
   ( portamento, in octaves )
@@ -239,47 +292,95 @@ dsp: k-ms20-voice-sample | io ctx state:Ms20VoiceState params:Ms20VoiceParams --
   oct -> state.oct
   oct exp2 -> params.note-hz
   ( MG and the envelopes )
-  state.mg-phase  params.mg-freq params.inv-sample-rate f*  phase-advance01
-  dup -> state.mg-phase
-  params.mg-wave 0.02 0.98 fclamp mg-shape | mg |
+  state.mg-phase | mph0 |
+  params.mg-freq  state.mg-oct exp2 f* | mghz |
+  mghz -> state.mg-hz
+  mph0  mghz params.inv-sample-rate f*  phase-advance01 | mph |
+  mph -> state.mg-phase
+  mph params.mg-wave 0.02 0.98 fclamp mg-shape | mg |
   state.flt-env&  params.flt-co&  env-rc-step | fenv |
   state.amp-env&  params.amp-co&  env-rc-step | aenv |
+  ( the patch panel: the cords' pull on each destination, 0 with none in )
+  params.bay-on 0.5 f>
+  [ state params ms20-bay ]
+  [ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ]  ifte | dpit d2 dpw dhc dlc dvca dmg din |
+  dmg -> state.mg-oct
+  ( the jacks the next sample reads; VCO1, VCO2 and the VCA store theirs
+    below.  S&H takes the noise when the MG wraps. )
+  state.noise-rng 2.0 f* 1.0 f- | wn |
+  mph mph0  wn state.sh  fsel-lt | sh |
+  sh -> state.sh
+  fenv state.jk& 1.0 f!i
+  aenv state.jk& 2.0 f!i
+  aenv fneg state.jk& 3.0 f!i
+  mg state.jk& 4.0 f!i
+  mph 0.5  1.0 -1.0  fsel-lt state.jk& 5.0 f!i
+  sh state.jk& 6.0 f!i
+  wn state.jk& 7.0 f!i
+  oct 8.031359 f- state.jk& 8.0 f!i
+  state.vel state.jk& 9.0 f!i
+  state.press state.jk& 10.0 f!i
   ( pitch-mod = 1 + mg*mg-pitch + fenv*eg-pitch )
-  1.0  mg params.mg-pitch f* f+  fenv params.eg-pitch f* f+ | pmod |
+  1.0  mg params.mg-pitch f* f+  fenv params.eg-pitch f* f+  dpit exp2 f* | pmod |
   ( pw = clamp[pulse-width + mg*mg-pw, 0.02, 0.98] )
-  params.pulse-width  mg params.mg-pw f* f+  0.02 0.98 fclamp | pw |
+  params.pulse-width  mg params.mg-pw f* f+  dpw f+  0.02 0.98 fclamp | pw |
+  pw -> state.pw-v
+  params.detune  d2 12.0 f* f+ -> state.det-v
   ( AGE: the VCOs share a board, so most of their drift is common
     [~6 cents RMS at 1] and a third of it their own - the pitch wanders,
     the interval between them barely does )
   params.age-amt 0.0035 f* | dscale |
   state.drv& params.drift-c drift-step | dv |
   state.dr1& params.drift-c drift-step 0.35 f* dv f+ dscale f* 1.0 f+ pmod f* | pmod1 |
-  state.dr2& params.drift-c drift-step 0.35 f* dv f+ dscale f* 1.0 f+ pmod f* | pmod2 |
+  state.dr2& params.drift-c drift-step 0.35 f* dv f+ dscale f* 1.0 f+ pmod f*  d2 exp2 f* | pmod2 |
   state params pmod1 pmod2 pw v-osc-mix | m |
   ( the coupling cap, then the HPF; the EG's bleed and the noise floor
     join after it )
   m state.dro-x state.dro-y params.dro-a droop-hp | md |
   m -> state.dro-x
   md -> state.dro-y
-  state params md v-hpf
-    fenv params.bleed f* f+
-    state.noise-rng 2.0 f* 1.0 f- 0.0001 f* f+ | x |
+  ( the noise floor reads the rng after the mixer's noise moved it )
+  fenv params.bleed f*  state.noise-rng 2.0 f* 1.0 f- 0.0001 f*  din f+ | bl nf |
   ( cutoff in octaves, like control voltage: base * 2^[env + MG] )
   fenv params.env-amount f*  mg params.mg-cutoff f*  f+
   state.drc& params.cut-drift-c drift-step  params.age-amt 0.07 f* f*  f+
-  exp2  params.cutoff f*
-    params.osr svf-g | g |
-  state.up& x up4 | x0 x1 x2 x3 |
-  state.dec&
-    state params x0 g v-lpf-sub
-    state params x1 g v-lpf-sub
-    state params x2 g v-lpf-sub
-    state params x3 g v-lpf-sub
-  dec4 | y |
+  dlc f+  exp2  params.cutoff f* | hz |
+  hz -> state.cut-hz
+  ( a cord on HPF CUT moves its coefficients every sample )
+  params.bay-hpf 0.5 f>
+  [ params.hpf-cutoff dhc exp2 f* | hh |
+    hh -> state.hpf-hz
+    hh  1.0 params.inv-sample-rate f/  svf-g 2.0 f* -> params.hpf-f
+    hh 20.0 15000.0 fclamp 3.141592653589793 f* params.osr f/ tan-warp  params.sk-pr& ms20-sk-set-ghp ]
+  [ params.hpf-cutoff -> state.hpf-hz ]  ifte
+  ( MODE: HOT/WET run the acid pair [1x HPF, ladder-style LPF]; K35/OTA
+    the MS-20's own filters, both at 4x, the cutoff held to 15 kHz )
+  params.lpf-mode 1.5 f<
+  [ state params md v-hpf  bl f+  nf f+ | x |
+    hz params.osr svf-g | g |
+    state.up& x up4 | x0 x1 x2 x3 |
+    state.dec&
+      state params x0 g v-lpf-sub
+      state params x1 g v-lpf-sub
+      state params x2 g v-lpf-sub
+      state params x3 g v-lpf-sub
+    dec4 ]
+  [ md bl f+  nf f+ | x |
+    hz 15000.0 fmin params.osr svf-g | g |
+    state.up& x up4 | x0 x1 x2 x3 |
+    state.dec&
+      state params x0 g v-sk-sub
+      state params x1 g v-sk-sub
+      state params x2 g v-sk-sub
+      state params x3 g v-sk-sub
+    dec4 ]  ifte | y |
   ( VCA: envelope, velocity, level; then a ~20 Hz DC block )
-  y aenv f*  state.vel f*  params.level f*  1.78 f* | v |
+  1.0 dvca f+ 0.0 fmax  params.level f* | lv |
+  lv -> state.vca-v
+  y aenv f*  state.vel f*  lv f*  1.78 f* | v |
   v state.dc-prev-x f-  state.dc-prev-y 0.9974 f*  f+ | o |
   v -> state.dc-prev-x
   o -> state.dc-prev-y
+  o state.jk& 13.0 f!i
   o io f!64
 ;
diff --git a/machines/acid/acid.fy b/machines/acid/acid.fy
new file mode 100644
index 00000000..22b29415
--- /dev/null
+++ b/machines/acid/acid.fy
@@ -0,0 +1,75 @@
+( acid.fy - Squelch 33: a TB-303-style bassline synth on the HOT/WET
+  lowpass that used to be the SM-24 Mono's.
+
+  The DSP is kernels/06-voices/acid_voice.fy; this file declares the
+  machine.  It is mono: an overlapping note slides, a loud one
+  [velocity over 0.8] is accented. )
+
+include "../../kernels/00-primitives/ctx.fy"  ( kernel ABI: Ctx, Io )
+include "../../kernels/06-voices/acid_voice.fy"
+include "../lib/manifest.fy"
+
+( ctx state params -- : a block's coefficients. )
+dsp: acid-block-prepare | ctx:Ctx state params:AcidParams -- |
+  ctx.inv-sr -> params.inv-sample-rate
+  ctx.sr 4.0 f* | osr |
+  osr -> params.osr
+  ( the MEG: decay only, falling on after key-up at the same rate )
+  params.meg-co&  0.003 params.decay 0.0 params.decay 0.0 0.0 ctx.inv-sr env-rc-coefs
+  params.mega-co&  0.003 0.2 0.0 0.2 0.0 0.0 ctx.inv-sr env-rc-coefs
+  params.vca-co&  0.002 3.0 0.0 0.008 0.0 0.0 ctx.inv-sr env-rc-coefs
+  ( slide: an RC covering 3 time constants in SLIDE )
+  1.0  -3.0  params.slide ctx.sr f* f/  exp  f- -> params.slide-c
+  params.tune 0.08333333333333333 f* exp2 -> params.tune-ratio
+  params.env-mod 5.0 f* -> params.env-oct
+  ( the accent RC: 15 ms, 60 ms at full RES, where accents stack )
+  1.0  -1.0  0.015 params.resonance 0.045 f* f+  ctx.sr f* f/  exp  f- -> params.acc-c
+  params.lpf-pr&  params.drive  params.resonance 1.6 f*  params.mode osr ms20-lpf-set
+  params.lpf-pr&  0.15 ms20-lpf-set-offs
+;
+
+: manifest
+  "Squelch 33" voice-sample machine*
+  "k-acid-voice-sample" render!
+  "acid-note-on"  note-on!
+  "acid-note-expr" note-expr!
+  "acid-note-off" note-off!
+  "acid-block-prepare" block-prepare!
+  AcidState.size  state-size!
+  AcidParams.size params-size!
+  560.0 panel-w!
+
+  ( module label id offset min max default curve )
+  "VCO" "TUNE" "tune" AcidParams.tune -12.0 12.0 0.0 curve-lin knob
+  "VCO" "WAVE" "wave" AcidParams.wave 0 switch
+    "SAW" 0.0 opt  "SQR" 1.0 opt
+
+  "VCF" "CUT"  "cutoff"    AcidParams.cutoff    30.0 8000.0 260.0 curve-exp knob
+  "VCF" "RES"  "resonance" AcidParams.resonance 0.0 1.0 0.6 curve-lin knob
+  "VCF" "ENV"  "env-mod"   AcidParams.env-mod   0.0 1.0 0.5 curve-lin knob
+  "VCF" "DEC"  "decay"     AcidParams.decay     0.2 2.0 0.5 curve-exp knob
+
+  "PLAY" "ACC"   "accent" AcidParams.accent 0.0 1.0 0.7 curve-lin knob
+  "PLAY" "SLIDE" "slide"  AcidParams.slide  0.02 0.3 0.06 curve-exp knob
+
+  "DRIVE" "DRV"  "drive" AcidParams.drive 0.25 4.0 1.0 curve-exp knob
+  "DRIVE" "MODE" "mode"  AcidParams.mode  0 switch
+    "HOT" 0.0 opt  "WET" 1.0 opt
+
+  "OUT" "LVL" "level" AcidParams.level 0.0 1.0 0.68 curve-pow knob
+
+  "VCO" 2 strip
+  "VCF" 4 strip
+  "PLAY" 2 strip
+  "DRIVE" 2 strip
+  "OUT" 1 strip
+
+  1.0 row
+    2.0 cell  "VCO" 1.0 item
+    4.0 cell  "VCF" 1.0 item
+    2.0 cell  "PLAY" 1.0 item
+    2.0 cell  "DRIVE" 1.0 item
+    1.0 cell  "OUT" 1.0 item
+
+  machine-desc
+;
diff --git a/machines/acid/presets/classic-squelch.preset b/machines/acid/presets/classic-squelch.preset
new file mode 100644
index 00000000..92e37f26
--- /dev/null
+++ b/machines/acid/presets/classic-squelch.preset
@@ -0,0 +1 @@
+{"slab": "preset", "schema": 1, "machine": "acid", "note": "Saw, RES high, a medium sweep: accents bark and stack", "params": {"tune": 0, "wave": 0, "cutoff": 220, "resonance": 0.78, "env-mod": 0.6, "decay": 0.45, "accent": 0.8, "slide": 0.06, "drive": 1.0, "mode": 0, "level": 0.63}}
\ No newline at end of file
diff --git a/machines/acid/presets/round-line.preset b/machines/acid/presets/round-line.preset
new file mode 100644
index 00000000..b0ac8f3c
--- /dev/null
+++ b/machines/acid/presets/round-line.preset
@@ -0,0 +1 @@
+{"slab": "preset", "schema": 1, "machine": "acid", "note": "Low RES and little sweep: a round bassline under a mix", "params": {"tune": 0, "wave": 0, "cutoff": 160, "resonance": 0.25, "env-mod": 0.25, "decay": 0.6, "accent": 0.5, "slide": 0.06, "drive": 1.0, "mode": 0, "level": 0.45}}
\ No newline at end of file
diff --git a/machines/acid/presets/square-bounce.preset b/machines/acid/presets/square-bounce.preset
new file mode 100644
index 00000000..ab4141b1
--- /dev/null
+++ b/machines/acid/presets/square-bounce.preset
@@ -0,0 +1 @@
+{"slab": "preset", "schema": 1, "machine": "acid", "note": "Square, short decay, moderate RES: a hollow rubbery line", "params": {"tune": 0, "wave": 1, "cutoff": 300, "resonance": 0.5, "env-mod": 0.45, "decay": 0.28, "accent": 0.7, "slide": 0.06, "drive": 1.0, "mode": 0, "level": 0.5}}
\ No newline at end of file
diff --git a/machines/acid/presets/wet-scream.preset b/machines/acid/presets/wet-scream.preset
new file mode 100644
index 00000000..3a7ee554
--- /dev/null
+++ b/machines/acid/presets/wet-scream.preset
@@ -0,0 +1 @@
+{"slab": "preset", "schema": 1, "machine": "acid", "note": "WET mode driven, RES near the top: screaming accents", "params": {"tune": 0, "wave": 0, "cutoff": 380, "resonance": 0.95, "env-mod": 0.7, "decay": 0.6, "accent": 1.0, "slide": 0.08, "drive": 2.0, "mode": 1, "level": 0.225}}
\ No newline at end of file
diff --git a/machines/ms20/ms20.fy b/machines/ms20/ms20.fy
index 9bbcde6a..ac0fe34f 100644
--- a/machines/ms20/ms20.fy
+++ b/machines/ms20/ms20.fy
@@ -25,6 +25,8 @@ dsp: ms20-block-prepare | ctx:Ctx state params:Ms20VoiceParams -- |
     1.0  -3.0  params.portamento ctx.sr f* f/  exp  f-
   fsel-lt -> params.porta-c
   params.lpf-pr&  params.drive  params.resonance 0.8 f*  params.lpf-mode osr ms20-lpf-set
+  params.sk-pr&  params.drive  params.resonance  params.hpf-resonance  params.lpf-mode
+    params.hpf-cutoff  osr  ms20-sk-set
   params.detune 0.08333333333333333 f* exp2 -> params.detune-ratio
   params.hpf-cutoff ctx.sr svf-g 2.0 f* -> params.hpf-f
   ( HPF damping [q = 1/Q] 1.4 [1 - RES/2]^2: flat at 0, Q 3 at 1, Q 18 at
@@ -41,8 +43,36 @@ dsp: ms20-block-prepare | ctx:Ctx state params:Ms20VoiceParams -- |
   0.0 -> params.bleed
   1.0  1.0  6.283185307179586 15.0 f* ctx.inv-sr f*  f+  f/ -> params.dro-a
   params.lpf-pr&  0.1 ag 0.2 f* f+  ms20-lpf-set-offs
+  ( the patch panel: is a cord in [SRC and DEST both set], does one
+    reach HPF CUT [its coefficients then move per sample] )
+  0.0 0.0 4 [ | i on |
+    i 1.0 f+
+    on
+      params.p-src& i f@i 0.5  0.0
+        params.p-dst& i f@i 0.5  0.0 1.0  fsel-lt  fsel-lt
+    fmax ] times nip -> params.bay-on
+  0.0 0.0 4 [ | i on |
+    i 1.0 f+
+    on
+      params.p-src& i f@i 0.5  0.0
+        params.p-dst& i f@i 4.0 f- fabs 0.5  1.0 0.0  fsel-lt  fsel-lt
+    fmax ] times nip -> params.bay-hpf
 ;
 
+( The patch panel's jacks and where they plug in [ms20_voice_probe.fy,
+  ms20-bay]: a cord's AMT at 1 moves PITCH and VCO2 2 octaves, PW 0.45,
+  the cutoffs 5 octaves, the VCA's gain by 1, MG FREQ 4 octaves; FLT IN
+  takes the source as audio into the filters. )
+: ms20-srcs
+  "OFF" 0.0 opt  "FENV" 1.0 opt  "AENV" 2.0 opt  "AENV-" 3.0 opt  "MG" 4.0 opt
+  "MG PUL" 5.0 opt  "S&H" 6.0 opt  "NOISE" 7.0 opt  "KBD" 8.0 opt  "VEL" 9.0 opt
+  "PRESS" 10.0 opt  "VCO1" 11.0 opt  "VCO2" 12.0 opt  "VCA OUT" 13.0 opt
+  as-display ;
+: ms20-dsts
+  "OFF" 0.0 opt  "PITCH" 1.0 opt  "VCO2" 2.0 opt  "PW" 3.0 opt  "HPF CUT" 4.0 opt
+  "LPF CUT" 5.0 opt  "VCA" 6.0 opt  "MG FREQ" 7.0 opt  "FLT IN" 8.0 opt
+  as-display ;
+
 : manifest
   "SM-24 Mono" voice-sample machine*
   "k-ms20-voice-sample" render!
@@ -73,12 +103,12 @@ dsp: ms20-block-prepare | ctx:Ctx state params:Ms20VoiceParams -- |
   "HPF" "CUT"  "hpf-cutoff"    Ms20VoiceParams.hpf-cutoff    20.0 15000.0 20.0 curve-exp knob
   "HPF" "PEAK" "hpf-resonance" Ms20VoiceParams.hpf-resonance 0.0 2.0 0.0 curve-lin knob
 
-  "LPF" "CUT"  "cutoff"    Ms20VoiceParams.cutoff    20.0 18000.0 700.0 curve-exp knob
-  "LPF" "PEAK" "resonance" Ms20VoiceParams.resonance 0.0 2.0 0.7 curve-lin knob
+  "LPF" "CUT"  "cutoff"    Ms20VoiceParams.cutoff    20.0 18000.0 1200.0 curve-exp knob
+  "LPF" "PEAK" "resonance" Ms20VoiceParams.resonance 0.0 2.0 1.0 curve-lin knob
   "LPF" "DRV"  "drive"     Ms20VoiceParams.drive     0.25 4.0 1.0 curve-exp knob
-  "LPF" "MODE" "lpf-mode"  Ms20VoiceParams.lpf-mode  0 switch
-    "HOT" 0.0 opt  "WET" 1.0 opt
-  "LPF" "ENV"  "env-amount" Ms20VoiceParams.env-amount 0.0 8.0 4.8 curve-lin knob
+  "LPF" "MODE" "lpf-mode"  Ms20VoiceParams.lpf-mode  2 switch
+    "HOT" 0.0 opt  "WET" 1.0 opt  "K35" 2.0 opt  "OTA" 3.0 opt
+  "LPF" "ENV"  "env-amount" Ms20VoiceParams.env-amount 0.0 8.0 2.0 curve-lin knob
 
   "VCA" "LVL" "level" Ms20VoiceParams.level 0.0 1.0 0.44 curve-pow knob
   "VCA" "AGE" "age"   Ms20VoiceParams.age-amt 0.0 1.0 0.4 curve-lin knob
@@ -91,8 +121,8 @@ dsp: ms20-block-prepare | ctx:Ctx state params:Ms20VoiceParams -- |
 
   "FLT ENV" "DLY" "filter-delay"   Ms20VoiceParams.filter-delay   0.0 10.0 0.0 curve-pow knob
   "FLT ENV" "ATK" "filter-attack"  Ms20VoiceParams.filter-attack  0.001 10.0 0.014 curve-exp knob
-  "FLT ENV" "DEC" "filter-decay"   Ms20VoiceParams.filter-decay   0.01 10.0 0.14 curve-exp knob
-  "FLT ENV" "SUS" "filter-sustain" Ms20VoiceParams.filter-sustain 0.0 1.0 0.18 curve-lin knob
+  "FLT ENV" "DEC" "filter-decay"   Ms20VoiceParams.filter-decay   0.01 10.0 0.3 curve-exp knob
+  "FLT ENV" "SUS" "filter-sustain" Ms20VoiceParams.filter-sustain 0.0 1.0 0.2 curve-lin knob
   "FLT ENV" "REL" "filter-release" Ms20VoiceParams.filter-release 0.01 10.0 0.11 curve-exp knob
 
   "MG" "FREQ" "mg-freq" Ms20VoiceParams.mg-freq 0.1 20.0 3.0 curve-exp knob
@@ -104,6 +134,51 @@ dsp: ms20-block-prepare | ctx:Ctx state params:Ms20VoiceParams -- |
   "MOD" "EG>PIT" "eg-pitch"  Ms20VoiceParams.eg-pitch  0.0 1.0 0.0 curve-pow knob
   "MOD" "PORTA"  "portamento" Ms20VoiceParams.portamento 0.0 10.0 0.0 curve-pow knob
 
+  ( ── the patch panel: SRC, DEST, AMT per cord ── )
+  "CORD 1" "SRC"  "ms20-c1-src" Ms20VoiceParams.p-src 0 + 0 switch ms20-srcs
+  "CORD 1" "DEST" "ms20-c1-dst" Ms20VoiceParams.p-dst 0 + 0 switch ms20-dsts
+  "CORD 1" "AMT"  "ms20-c1-amt" Ms20VoiceParams.p-amt 0 + -1.0 1.0 0.0 curve-lin knob
+  "CORD 2" "SRC"  "ms20-c2-src" Ms20VoiceParams.p-src 8 + 0 switch ms20-srcs
+  "CORD 2" "DEST" "ms20-c2-dst" Ms20VoiceParams.p-dst 8 + 0 switch ms20-dsts
+  "CORD 2" "AMT"  "ms20-c2-amt" Ms20VoiceParams.p-amt 8 + -1.0 1.0 0.0 curve-lin knob
+  "CORD 3" "SRC"  "ms20-c3-src" Ms20VoiceParams.p-src 16 + 0 switch ms20-srcs
+  "CORD 3" "DEST" "ms20-c3-dst" Ms20VoiceParams.p-dst 16 + 0 switch ms20-dsts
+  "CORD 3" "AMT"  "ms20-c3-amt" Ms20VoiceParams.p-amt 16 + -1.0 1.0 0.0 curve-lin knob
+  "CORD 4" "SRC"  "ms20-c4-src" Ms20VoiceParams.p-src 24 + 0 switch ms20-srcs
+  "CORD 4" "DEST" "ms20-c4-dst" Ms20VoiceParams.p-dst 24 + 0 switch ms20-dsts
+  "CORD 4" "AMT"  "ms20-c4-amt" Ms20VoiceParams.p-amt 24 + -1.0 1.0 0.0 curve-lin knob
+  "CORD 1" 3 strip  "CORD 2" 3 strip  "CORD 3" 3 strip  "CORD 4" 3 strip
+
+  ( the jacks in the dock, and the knobs a cord can reach [docs/15 §Modulation] )
+  "FENV"    1 Ms20VoiceState.flt-env EnvRc.level + 0 mod-source
+  "AENV"    2 Ms20VoiceState.amp-env EnvRc.level + 0 mod-source
+  "MG"      4 Ms20VoiceState.jk 32 + 1 mod-source
+  "MG PUL"  5 Ms20VoiceState.jk 40 + 1 mod-source
+  "S&H"     6 Ms20VoiceState.sh 1 mod-source
+  "NOISE"   7 Ms20VoiceState.jk 56 + 1 mod-source
+  "KBD"     8 Ms20VoiceState.jk 64 + 1 mod-source
+  "VEL"     9 Ms20VoiceState.vel 0 mod-source
+  "PRESS"  10 Ms20VoiceState.press 0 mod-source
+  "VCO1"   11 Ms20VoiceState.jk 88 + 1 mod-source
+  "VCO2"   12 Ms20VoiceState.jk 96 + 1 mod-source
+  "VCA OUT" 13 Ms20VoiceState.jk 104 + 1 mod-source
+  "detune"      2 Ms20VoiceState.det-v  mod-dest
+  "pulse-width" 3 Ms20VoiceState.pw-v   mod-dest
+  "hpf-cutoff"  4 Ms20VoiceState.hpf-hz mod-dest
+  "cutoff"      5 Ms20VoiceState.cut-hz mod-dest
+  "level"       6 Ms20VoiceState.vca-v  mod-dest
+  "mg-freq"     7 Ms20VoiceState.mg-hz  mod-dest
+  ( the MS-20's normalled routes, as fixed rows )
+  "env-amount" 1 5 mod-fixed   ( FENV -> LPF CUT )
+  "mg-cutoff"  4 5 mod-fixed   ( MG -> LPF CUT )
+  "eg-pitch"   1 1 mod-fixed   ( FENV -> PITCH )
+  "mg-pitch"   4 1 mod-fixed   ( MG -> PITCH )
+  "mg-pw"      4 3 mod-fixed   ( MG -> PW )
+  "ms20-c" 4 mod-matrix
+  "PATCH DOCK" mod-dock
+  "CORDS" matrix-display
+  "SCOPE" scope-display
+
   ( The MS-20 face in two rows: the signal path left to right over the
     modulation section.  Waves and scales are LED lists. )
   "VCO1" 2 strip
@@ -120,6 +195,9 @@ dsp: ms20-block-prepare | ctx:Ctx state params:Ms20VoiceParams -- |
   ( built-in visualizer cell [docs/15]; comma-separated sources overlay )
   "EG" "FLT ENV,AMP ENV" adsr-display
 
+  "PANEL" page
+  0.16 row
+    1.0 cell  "PATCH DOCK" 1.0 item
   1.0 row
     1.0 cell  "VCO1" 1.0 item
     1.0 cell  "VCO2" 1.0 item
@@ -133,6 +211,13 @@ dsp: ms20-block-prepare | ctx:Ctx state params:Ms20VoiceParams -- |
     1.0 cell  "FLT ENV" 1.0 item
     1.0 cell  "AMP ENV" 1.0 item
     4.0 cell  "EG" 1.0 item
+  ( the patch panel: drag a jack onto a ringed knob, or onto a cord )
+  "PATCH" page
+  0.16 row
+    1.0 cell  "PATCH DOCK" 1.0 item
+  1.0 row
+    2.0 cell  "CORDS" 1.0 item
+    1.0 cell  "SCOPE" 1.0 item
 
   machine-desc
 ;
diff --git a/machines/ms20/presets/k35-round-bass.preset b/machines/ms20/presets/k35-round-bass.preset
new file mode 100644
index 00000000..e2a00bb0
--- /dev/null
+++ b/machines/ms20/presets/k35-round-bass.preset
@@ -0,0 +1 @@
+{"slab": "preset", "schema": 1, "machine": "ms20", "note": "K35 bass: full low end, a gentle peak, short EG2 sweep", "params": {"vco1-wave": 1, "vco-octave": 2, "vco2-wave": 1, "vco2-octave": 0, "detune": 0.07, "pulse-width": 0.7, "saw-level": 0.8, "pulse-level": 0.5, "noise-level": 0, "hpf-cutoff": 20, "hpf-resonance": 0, "cutoff": 420, "resonance": 1.0, "drive": 1.2, "lpf-mode": 2, "env-amount": 2.5, "level": 0.5, "amp-attack": 0.002, "amp-decay": 0.4, "amp-sustain": 0.7, "amp-release": 0.08, "filter-attack": 0.002, "filter-decay": 0.25, "filter-sustain": 0.1, "filter-release": 0.15, "mg-freq": 5.0, "mg-wave": 0.5, "mg-pitch": 0, "mg-pw": 0, "mg-cutoff": 0, "eg-pitch": 0}}
\ No newline at end of file
diff --git a/machines/ms20/presets/k35-scream.preset b/machines/ms20/presets/k35-scream.preset
new file mode 100644
index 00000000..b37dec8c
--- /dev/null
+++ b/machines/ms20/presets/k35-scream.preset
@@ -0,0 +1 @@
+{"slab": "preset", "schema": 1, "machine": "ms20", "note": "K35 filters both peaked and driven: the early MS-20 scream", "params": {"vco1-wave": 1, "vco-octave": 2, "vco2-wave": 0, "vco2-octave": 1, "detune": 0.12, "pulse-width": 0.7, "saw-level": 0.8, "pulse-level": 0.6, "noise-level": 0, "hpf-cutoff": 300, "hpf-resonance": 1.4, "cutoff": 1500, "resonance": 1.65, "drive": 2.2, "lpf-mode": 2, "env-amount": 2.0, "level": 0.5, "amp-attack": 0.005, "amp-decay": 0.3, "amp-sustain": 0.85, "amp-release": 0.25, "filter-attack": 0.002, "filter-decay": 0.6, "filter-sustain": 0.4, "filter-release": 0.15, "mg-freq": 5.5, "mg-wave": 0.5, "mg-pitch": 0.004, "mg-pw": 0, "mg-cutoff": 0, "eg-pitch": 0}}
\ No newline at end of file
diff --git a/machines/ms20/presets/ota-singing-lead.preset b/machines/ms20/presets/ota-singing-lead.preset
new file mode 100644
index 00000000..efad335d
--- /dev/null
+++ b/machines/ms20/presets/ota-singing-lead.preset
@@ -0,0 +1 @@
+{"slab": "preset", "schema": 1, "machine": "ms20", "note": "OTA LPF, peak high and clean: the later MS-20, symmetric and singing", "params": {"vco1-wave": 1, "vco-octave": 2, "vco2-wave": 0, "vco2-octave": 2, "detune": 0.1, "pulse-width": 0.7, "saw-level": 0.8, "pulse-level": 0.45, "noise-level": 0, "hpf-cutoff": 120, "hpf-resonance": 0.8, "cutoff": 1100, "resonance": 1.5, "drive": 1.0, "lpf-mode": 3, "env-amount": 2.2, "level": 0.3, "amp-attack": 0.005, "amp-decay": 0.3, "amp-sustain": 0.85, "amp-release": 0.25, "filter-attack": 0.002, "filter-decay": 0.5, "filter-sustain": 0.35, "filter-release": 0.15, "mg-freq": 5.2, "mg-wave": 0.5, "mg-pitch": 0.004, "mg-pw": 0, "mg-cutoff": 0, "eg-pitch": 0, "portamento": 0.06}}
\ No newline at end of file
diff --git a/machines/ms20/presets/patch-feedback-growl.preset b/machines/ms20/presets/patch-feedback-growl.preset
new file mode 100644
index 00000000..533df8ed
--- /dev/null
+++ b/machines/ms20/presets/patch-feedback-growl.preset
@@ -0,0 +1 @@
+{"slab": "preset", "schema": 1, "machine": "ms20", "note": "VCA OUT back into FLT IN: the OTA growls and sings as the note swells", "params": {"vco1-wave": 1, "vco-octave": 2, "vco2-wave": 1, "vco2-octave": 0, "detune": 0.07, "pulse-width": 0.7, "saw-level": 0.8, "pulse-level": 0.5, "noise-level": 0, "hpf-cutoff": 20, "hpf-resonance": 0, "cutoff": 500, "resonance": 1.3, "drive": 1.5, "lpf-mode": 3, "env-amount": 2.5, "level": 0.32, "amp-attack": 0.002, "amp-decay": 0.4, "amp-sustain": 0.8, "amp-release": 0.08, "filter-attack": 0.002, "filter-decay": 0.4, "filter-sustain": 0.3, "filter-release": 0.15, "mg-freq": 5.0, "mg-wave": 0.5, "mg-pitch": 0, "mg-pw": 0, "mg-cutoff": 0, "eg-pitch": 0, "age": 0.4, "portamento": 0, "filter-delay": 0, "amp-hold": 0, "ms20-c1-src": 13, "ms20-c1-dst": 8, "ms20-c1-amt": 0.9, "ms20-c2-src": 2, "ms20-c2-dst": 5, "ms20-c2-amt": 0.25, "ms20-c3-src": 0, "ms20-c3-dst": 0, "ms20-c3-amt": 0.0, "ms20-c4-src": 0, "ms20-c4-dst": 0, "ms20-c4-amt": 0.0}}
\ No newline at end of file
diff --git a/machines/ms20/presets/patch-fm-metal-bass.preset b/machines/ms20/presets/patch-fm-metal-bass.preset
new file mode 100644
index 00000000..f394efa1
--- /dev/null
+++ b/machines/ms20/presets/patch-fm-metal-bass.preset
@@ -0,0 +1 @@
+{"slab": "preset", "schema": 1, "machine": "ms20", "note": "VCO2 a fifth up into LPF CUT at audio rate: a metallic, clangy bass", "params": {"vco1-wave": 1, "vco-octave": 2, "vco2-wave": 0, "vco2-octave": 0, "detune": 7.0, "pulse-width": 0.7, "saw-level": 0.8, "pulse-level": 0.3, "noise-level": 0, "hpf-cutoff": 20, "hpf-resonance": 0, "cutoff": 500, "resonance": 1.1, "drive": 1.2, "lpf-mode": 2, "env-amount": 2.0, "level": 0.64, "amp-attack": 0.002, "amp-decay": 0.4, "amp-sustain": 0.7, "amp-release": 0.08, "filter-attack": 0.002, "filter-decay": 0.25, "filter-sustain": 0.1, "filter-release": 0.15, "mg-freq": 5.0, "mg-wave": 0.5, "mg-pitch": 0, "mg-pw": 0, "mg-cutoff": 0, "eg-pitch": 0, "age": 0.4, "portamento": 0, "filter-delay": 0, "amp-hold": 0, "ms20-c1-src": 12, "ms20-c1-dst": 5, "ms20-c1-amt": 0.25, "ms20-c2-src": 0, "ms20-c2-dst": 0, "ms20-c2-amt": 0.0, "ms20-c3-src": 0, "ms20-c3-dst": 0, "ms20-c3-amt": 0.0, "ms20-c4-src": 0, "ms20-c4-dst": 0, "ms20-c4-amt": 0.0}}
\ No newline at end of file
diff --git a/machines/ms20/presets/patch-sh-bubbles.preset b/machines/ms20/presets/patch-sh-bubbles.preset
new file mode 100644
index 00000000..320c1c58
--- /dev/null
+++ b/machines/ms20/presets/patch-sh-bubbles.preset
@@ -0,0 +1 @@
+{"slab": "preset", "schema": 1, "machine": "ms20", "note": "S&H on LPF CUT, clocked by the MG: random bubbling under a peaked K35", "params": {"vco1-wave": 2, "vco-octave": 2, "vco2-wave": 1, "vco2-octave": 0, "detune": 0.07, "pulse-width": 0.6, "saw-level": 0.8, "pulse-level": 0.0, "noise-level": 0, "hpf-cutoff": 20, "hpf-resonance": 0, "cutoff": 700, "resonance": 1.5, "drive": 1.2, "lpf-mode": 2, "env-amount": 1.0, "level": 0.45, "amp-attack": 0.002, "amp-decay": 0.3, "amp-sustain": 0.8, "amp-release": 0.08, "filter-attack": 0.002, "filter-decay": 0.2, "filter-sustain": 0.3, "filter-release": 0.15, "mg-freq": 7.0, "mg-wave": 0.5, "mg-pitch": 0, "mg-pw": 0, "mg-cutoff": 0, "eg-pitch": 0, "age": 0.4, "portamento": 0, "filter-delay": 0, "amp-hold": 0, "ms20-c1-src": 6, "ms20-c1-dst": 5, "ms20-c1-amt": 0.3, "ms20-c2-src": 0, "ms20-c2-dst": 0, "ms20-c2-amt": 0.0, "ms20-c3-src": 0, "ms20-c3-dst": 0, "ms20-c3-amt": 0.0, "ms20-c4-src": 0, "ms20-c4-dst": 0, "ms20-c4-amt": 0.0}}
\ No newline at end of file
diff --git a/machines/ms20/presets/patch-tracking-lead.preset b/machines/ms20/presets/patch-tracking-lead.preset
new file mode 100644
index 00000000..bdde9219
--- /dev/null
+++ b/machines/ms20/presets/patch-tracking-lead.preset
@@ -0,0 +1 @@
+{"slab": "preset", "schema": 1, "machine": "ms20", "note": "KBD on LPF CUT for full tracking, MG on PITCH for a slow vibrato, PRESS opens it", "params": {"vco1-wave": 1, "vco-octave": 3, "vco2-wave": 1, "vco2-octave": 2, "detune": 0.08, "pulse-width": 0.7, "saw-level": 0.8, "pulse-level": 0.5, "noise-level": 0, "hpf-cutoff": 20, "hpf-resonance": 0, "cutoff": 900, "resonance": 1.2, "drive": 1.2, "lpf-mode": 2, "env-amount": 1.5, "level": 0.4, "amp-attack": 0.002, "amp-decay": 0.4, "amp-sustain": 0.9, "amp-release": 0.25, "filter-attack": 0.002, "filter-decay": 0.5, "filter-sustain": 0.4, "filter-release": 0.15, "mg-freq": 5.5, "mg-wave": 0.5, "mg-pitch": 0, "mg-pw": 0, "mg-cutoff": 0, "eg-pitch": 0, "age": 0.4, "portamento": 0.06, "filter-delay": 0, "amp-hold": 0, "ms20-c1-src": 8, "ms20-c1-dst": 5, "ms20-c1-amt": 0.2, "ms20-c2-src": 4, "ms20-c2-dst": 1, "ms20-c2-amt": 0.006, "ms20-c3-src": 10, "ms20-c3-dst": 5, "ms20-c3-amt": 0.3, "ms20-c4-src": 0, "ms20-c4-dst": 0, "ms20-c4-amt": 0.0}}
\ No newline at end of file
diff --git a/machines/ms20/presets/patch-vowel-sweep.preset b/machines/ms20/presets/patch-vowel-sweep.preset
new file mode 100644
index 00000000..23c63015
--- /dev/null
+++ b/machines/ms20/presets/patch-vowel-sweep.preset
@@ -0,0 +1 @@
+{"slab": "preset", "schema": 1, "machine": "ms20", "note": "FENV on HPF CUT with both filters peaked: a talking band-pass sweep", "params": {"vco1-wave": 1, "vco-octave": 3, "vco2-wave": 1, "vco2-octave": 2, "detune": 0.07, "pulse-width": 0.7, "saw-level": 0.8, "pulse-level": 0.5, "noise-level": 0, "hpf-cutoff": 140, "hpf-resonance": 1.6, "cutoff": 1400, "resonance": 1.6, "drive": 1.6, "lpf-mode": 2, "env-amount": 0.8, "level": 1.0, "amp-attack": 0.002, "amp-decay": 0.4, "amp-sustain": 0.8, "amp-release": 0.08, "filter-attack": 0.002, "filter-decay": 0.6, "filter-sustain": 0.2, "filter-release": 0.15, "mg-freq": 5.0, "mg-wave": 0.5, "mg-pitch": 0, "mg-pw": 0, "mg-cutoff": 0, "eg-pitch": 0, "age": 0.4, "portamento": 0, "filter-delay": 0, "amp-hold": 0, "ms20-c1-src": 1, "ms20-c1-dst": 4, "ms20-c1-amt": 0.45, "ms20-c2-src": 0, "ms20-c2-dst": 0, "ms20-c2-amt": 0.0, "ms20-c3-src": 0, "ms20-c3-dst": 0, "ms20-c3-amt": 0.0, "ms20-c4-src": 0, "ms20-c4-dst": 0, "ms20-c4-amt": 0.0}}
\ No newline at end of file
diff --git a/songs/k35_night_run.py b/songs/k35_night_run.py
new file mode 100644
index 00000000..79ce25b8
--- /dev/null
+++ b/songs/k35_night_run.py
@@ -0,0 +1,58 @@
+"""K35 Night Run — a 122 BPM listening test for the SM-24 Mono's K35/OTA filters.
+
+Generate: PYTHONPATH=tools python3 songs/k35_night_run.py
+Render:   ... --render
+
+The bass plays alone for four bars, then the drums come in and the K35's
+CUT opens over eight bars while PEAK climbs.  The last eight bars add an
+OTA lead and the k35-scream lead, both filters peaked.
+"""
+import argparse
+from slabkit import Song, fx
+
+song = Song("K35 Night Run", bpm=122, key="A minor")
+intro = song.section("BASS ALONE", 4)
+groove = song.section("OPENING UP", 8)
+scream = song.section("SCREAM", 8)
+
+kit = song.track("DRUMS", "drum2", "tough-night-kit", volume=0.8,
+                 fx=[fx("comp2", "dry-drum-punch")])
+bass = song.track("K35 BASS", "ms20", "k35-round-bass", volume=0.62,
+                  fx=[fx("eq2", hpf_on="ON", hpf_hz=34)],
+                  params=dict(lpf_mode="K35", cutoff=380, resonance=1.0,
+                              drive=1.6, env_amount=2.6, filter_decay=0.18,
+                              filter_sustain=0.05, age=0.3))
+lead = song.track("OTA LEAD", "ms20", "ota-singing-lead", volume=0.75, pan=-0.15,
+                  fx=[fx("delay2", mix=0.22)])
+scr = song.track("K35 SCREAM", "ms20", "k35-scream", volume=0.7, pan=0.15,
+                 fx=[fx("verb2", mix=0.18)])
+
+song.master(fx=[fx("comp2", "gentle-bus-glue"), fx("limiter2", gain=5, ceil=-1)])
+
+LINE = ("A1! . A1 A2 . A1 G1~ A1 . A1 C2 . A1! . E2 D2 |"
+        " A1! . A1 A2 . A1 G1~ A1 . C2 . E2! . G2 . E2")
+for sec in (intro, groove, scream):
+    bass.clip(sec).seq(LINE, gate=0.55).repeat(8)
+
+for sec in (groove, scream):
+    kit.clip(sec).drums({"kick": "x...x...x...x...",
+                         "snare": "....x.......x...",
+                         "ch": "..x...x...x...x.",
+                         "oh": "..............x."}, bars=8)
+
+# CUT opens and PEAK climbs over the groove; the scream section keeps them up
+g0 = groove.start * 4
+bass.ramp("cutoff", g0, g0 + 32, 380, 1400, tension=-0.3)
+bass.ramp("resonance", g0, g0 + 32, 1.0, 1.55)
+
+lead.clip(scream).melody("E5:1.5 D5:.5 C5:1 B4:1 | A4:2 r:1 C5:1 | "
+                         "E5:1.5 G5:.5 E5:1 D5:1 | C5:3 r:1")
+scr.clip(scream, bars=4, at_bar=4).melody("A5:2 G5:1 E5:1 | A5:3 r:1")
+
+if __name__ == "__main__":
+    ap = argparse.ArgumentParser()
+    ap.add_argument("--render", action="store_true")
+    a = ap.parse_args()
+    song.save()
+    if a.render:
+        song.render()
diff --git a/songs/k35_night_run.slab/project.json b/songs/k35_night_run.slab/project.json
new file mode 100644
index 00000000..9b6dd159
--- /dev/null
+++ b/songs/k35_night_run.slab/project.json
@@ -0,0 +1,2813 @@
+{
+ "slab": "project",
+ "schema": 1,
+ "transport": {
+  "bpm": 122.0,
+  "loop": {
+   "on": false,
+   "start": 0.0,
+   "end": 80.0
+  }
+ },
+ "meter": [
+  {
+   "bar": 0,
+   "num": 4,
+   "den": 4
+  }
+ ],
+ "sections": [
+  {
+   "beat": 0.0,
+   "name": "BASS ALONE",
+   "color": 4
+  },
+  {
+   "beat": 16.0,
+   "name": "OPENING UP",
+   "color": 5
+  },
+  {
+   "beat": 48.0,
+   "name": "SCREAM",
+   "color": 6
+  }
+ ],
+ "end": 80.0,
+ "tracks": [
+  {
+   "name": "DRUMS",
+   "color": [
+    230,
+    90,
+    120
+   ],
+   "volume": 0.8,
+   "pan": 0.0,
+   "mute": false,
+   "solo": false,
+   "instrument": {
+    "machine": "drum2",
+    "params": {
+     "kick-tune": 50,
+     "kick-sweep": 5,
+     "kick-bend": 0.04,
+     "kick-decay": 0.3,
+     "kick-click": 0.5,
+     "kick-drive": 2.2,
+     "kick-level": 0.9,
+     "snare-tune": 185,
+     "snare-decay": 0.13,
+     "snare-snap": 0.85,
+     "snare-sdec": 0.08,
+     "snare-tone": 2000,
+     "snare-level": 0.85,
+     "clap-tone": 1200,
+     "clap-spread": 0.01,
+     "clap-decay": 0.2,
+     "clap-level": 0.8,
+     "hat-tune": 1.05,
+     "hat-tone": 1.0,
+     "hat-chdec": 0.045,
+     "hat-ohdec": 0.4,
+     "hat-level": 0.85,
+     "tom-tune": 120,
+     "tom-sweep": 1.2,
+     "tom-decay": 0.25,
+     "tom-drive": 1.4,
+     "tom-level": 0.82,
+     "master-accent": 0.7,
+     "master-drive": 1.7,
+     "master-level": 0.9
+    },
+    "preset": "tough-night-kit"
+   },
+   "effects": [
+    {
+     "machine": "comp2",
+     "params": {
+      "comp-thresh": -15.8,
+      "comp-ratio": 4,
+      "comp-knee": 4,
+      "comp-atk": 0.01,
+      "comp-rel": 0.06,
+      "comp-hpf": 20,
+      "comp-det": 0,
+      "comp-makeup": 3.4,
+      "comp-mix": 1
+     },
+     "bypass": false,
+     "preset": "dry-drum-punch"
+    }
+   ],
+   "clips": [
+    {
+     "type": "note",
+     "name": "OPENING UP",
+     "start": 16.0,
+     "len": 32.0,
+     "notes": [
+      {
+       "pitch": 36,
+       "start": 0.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 0.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 1.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 38,
+       "start": 1.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 1.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 2.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 2.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 3.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 38,
+       "start": 3.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 3.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 46,
+       "start": 3.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 4.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 4.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 5.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 38,
+       "start": 5.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 5.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 6.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 6.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 7.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 38,
+       "start": 7.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 7.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 46,
+       "start": 7.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 8.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 8.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 9.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 38,
+       "start": 9.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 9.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 10.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 10.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 11.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 38,
+       "start": 11.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 11.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 46,
+       "start": 11.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 12.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 12.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 13.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 38,
+       "start": 13.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 13.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 14.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 14.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 15.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 38,
+       "start": 15.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 15.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 46,
+       "start": 15.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 16.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 16.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 17.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 38,
+       "start": 17.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 17.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 18.0,
+       "len": 0.1,
+       "vel": 100
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+       "len": 0.1375,
+       "vel": 96
+      },
+      {
+       "pitch": 40,
+       "start": 22.75,
+       "len": 0.1375,
+       "vel": 124
+      },
+      {
+       "pitch": 43,
+       "start": 23.25,
+       "len": 0.1375,
+       "vel": 96
+      },
+      {
+       "pitch": 40,
+       "start": 23.75,
+       "len": 0.1375,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 24.0,
+       "len": 0.1375,
+       "vel": 124
+      },
+      {
+       "pitch": 33,
+       "start": 24.5,
+       "len": 0.1375,
+       "vel": 96
+      },
+      {
+       "pitch": 45,
+       "start": 24.75,
+       "len": 0.1375,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 25.25,
+       "len": 0.1375,
+       "vel": 96
+      },
+      {
+       "pitch": 31,
+       "start": 25.5,
+       "len": 0.275,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 25.75,
+       "len": 0.1375,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 26.25,
+       "len": 0.1375,
+       "vel": 96
+      },
+      {
+       "pitch": 36,
+       "start": 26.5,
+       "len": 0.1375,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 27.0,
+       "len": 0.1375,
+       "vel": 124
+      },
+      {
+       "pitch": 40,
+       "start": 27.5,
+       "len": 0.1375,
+       "vel": 96
+      },
+      {
+       "pitch": 38,
+       "start": 27.75,
+       "len": 0.1375,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 28.0,
+       "len": 0.1375,
+       "vel": 124
+      },
+      {
+       "pitch": 33,
+       "start": 28.5,
+       "len": 0.1375,
+       "vel": 96
+      },
+      {
+       "pitch": 45,
+       "start": 28.75,
+       "len": 0.1375,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 29.25,
+       "len": 0.1375,
+       "vel": 96
+      },
+      {
+       "pitch": 31,
+       "start": 29.5,
+       "len": 0.275,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 29.75,
+       "len": 0.1375,
+       "vel": 96
+      },
+      {
+       "pitch": 36,
+       "start": 30.25,
+       "len": 0.1375,
+       "vel": 96
+      },
+      {
+       "pitch": 40,
+       "start": 30.75,
+       "len": 0.1375,
+       "vel": 124
+      },
+      {
+       "pitch": 43,
+       "start": 31.25,
+       "len": 0.1375,
+       "vel": 96
+      },
+      {
+       "pitch": 40,
+       "start": 31.75,
+       "len": 0.1375,
+       "vel": 96
+      }
+     ]
+    }
+   ],
+   "automation": [
+    {
+     "target": "inst:cutoff",
+     "points": [
+      [
+       64.0,
+       380,
+       "curve",
+       -0.3
+      ],
+      [
+       96.0,
+       1400
+      ]
+     ]
+    },
+    {
+     "target": "inst:resonance",
+     "points": [
+      [
+       64.0,
+       1.0
+      ],
+      [
+       96.0,
+       1.55
+      ]
+     ]
+    }
+   ]
+  },
+  {
+   "name": "OTA LEAD",
+   "color": [
+    150,
+    110,
+    230
+   ],
+   "volume": 0.75,
+   "pan": -0.15,
+   "mute": false,
+   "solo": false,
+   "instrument": {
+    "machine": "ms20",
+    "params": {
+     "vco1-wave": 1,
+     "vco-octave": 2,
+     "vco2-wave": 0,
+     "vco2-octave": 2,
+     "detune": 0.1,
+     "pulse-width": 0.7,
+     "saw-level": 0.8,
+     "pulse-level": 0.45,
+     "noise-level": 0,
+     "hpf-cutoff": 120,
+     "hpf-resonance": 0.8,
+     "cutoff": 1100,
+     "resonance": 1.5,
+     "drive": 1.0,
+     "lpf-mode": 3,
+     "env-amount": 2.2,
+     "level": 0.3,
+     "amp-attack": 0.005,
+     "amp-decay": 0.3,
+     "amp-sustain": 0.85,
+     "amp-release": 0.25,
+     "filter-attack": 0.002,
+     "filter-decay": 0.5,
+     "filter-sustain": 0.35,
+     "filter-release": 0.15,
+     "mg-freq": 5.2,
+     "mg-wave": 0.5,
+     "mg-pitch": 0.004,
+     "mg-pw": 0,
+     "mg-cutoff": 0,
+     "eg-pitch": 0,
+     "portamento": 0.06
+    },
+    "preset": "ota-singing-lead"
+   },
+   "effects": [
+    {
+     "machine": "delay2",
+     "params": {
+      "delay-mix": 0.22
+     },
+     "bypass": false
+    }
+   ],
+   "clips": [
+    {
+     "type": "note",
+     "name": "SCREAM",
+     "start": 48.0,
+     "len": 32.0,
+     "notes": [
+      {
+       "pitch": 76,
+       "start": 0.0,
+       "len": 1.425,
+       "vel": 100
+      },
+      {
+       "pitch": 74,
+       "start": 1.5,
+       "len": 0.475,
+       "vel": 100
+      },
+      {
+       "pitch": 72,
+       "start": 2.0,
+       "len": 0.95,
+       "vel": 100
+      },
+      {
+       "pitch": 71,
+       "start": 3.0,
+       "len": 0.95,
+       "vel": 100
+      },
+      {
+       "pitch": 69,
+       "start": 4.0,
+       "len": 1.9,
+       "vel": 100
+      },
+      {
+       "pitch": 72,
+       "start": 7.0,
+       "len": 0.95,
+       "vel": 100
+      },
+      {
+       "pitch": 76,
+       "start": 8.0,
+       "len": 1.425,
+       "vel": 100
+      },
+      {
+       "pitch": 79,
+       "start": 9.5,
+       "len": 0.475,
+       "vel": 100
+      },
+      {
+       "pitch": 76,
+       "start": 10.0,
+       "len": 0.95,
+       "vel": 100
+      },
+      {
+       "pitch": 74,
+       "start": 11.0,
+       "len": 0.95,
+       "vel": 100
+      },
+      {
+       "pitch": 72,
+       "start": 12.0,
+       "len": 2.85,
+       "vel": 100
+      }
+     ]
+    }
+   ]
+  },
+  {
+   "name": "K35 SCREAM",
+   "color": [
+    250,
+    190,
+    80
+   ],
+   "volume": 0.7,
+   "pan": 0.15,
+   "mute": false,
+   "solo": false,
+   "instrument": {
+    "machine": "ms20",
+    "params": {
+     "vco1-wave": 1,
+     "vco-octave": 2,
+     "vco2-wave": 0,
+     "vco2-octave": 1,
+     "detune": 0.12,
+     "pulse-width": 0.7,
+     "saw-level": 0.8,
+     "pulse-level": 0.6,
+     "noise-level": 0,
+     "hpf-cutoff": 300,
+     "hpf-resonance": 1.4,
+     "cutoff": 1500,
+     "resonance": 1.65,
+     "drive": 2.2,
+     "lpf-mode": 2,
+     "env-amount": 2.0,
+     "level": 0.5,
+     "amp-attack": 0.005,
+     "amp-decay": 0.3,
+     "amp-sustain": 0.85,
+     "amp-release": 0.25,
+     "filter-attack": 0.002,
+     "filter-decay": 0.6,
+     "filter-sustain": 0.4,
+     "filter-release": 0.15,
+     "mg-freq": 5.5,
+     "mg-wave": 0.5,
+     "mg-pitch": 0.004,
+     "mg-pw": 0,
+     "mg-cutoff": 0,
+     "eg-pitch": 0
+    },
+    "preset": "k35-scream"
+   },
+   "effects": [
+    {
+     "machine": "verb2",
+     "params": {
+      "verb-mix": 0.18
+     },
+     "bypass": false
+    }
+   ],
+   "clips": [
+    {
+     "type": "note",
+     "name": "SCREAM",
+     "start": 64.0,
+     "len": 16.0,
+     "notes": [
+      {
+       "pitch": 81,
+       "start": 0.0,
+       "len": 1.9,
+       "vel": 100
+      },
+      {
+       "pitch": 79,
+       "start": 2.0,
+       "len": 0.95,
+       "vel": 100
+      },
+      {
+       "pitch": 76,
+       "start": 3.0,
+       "len": 0.95,
+       "vel": 100
+      },
+      {
+       "pitch": 81,
+       "start": 4.0,
+       "len": 2.85,
+       "vel": 100
+      }
+     ]
+    }
+   ]
+  }
+ ],
+ "master": {
+  "volume": 1.0,
+  "pan": 0.0,
+  "subsonic": false,
+  "effects": [
+   {
+    "machine": "comp2",
+    "params": {
+     "comp-thresh": -14.1,
+     "comp-ratio": 2,
+     "comp-knee": 9,
+     "comp-atk": 0.03,
+     "comp-rel": 0.2,
+     "comp-hpf": 90,
+     "comp-det": 0,
+     "comp-makeup": 1.3,
+     "comp-mix": 1
+    },
+    "bypass": false,
+    "preset": "gentle-bus-glue"
+   },
+   {
+    "machine": "limiter2",
+    "params": {
+     "lim-gain": 5,
+     "lim-ceil": -1
+    },
+    "bypass": false
+   }
+  ]
+ }
+}
\ No newline at end of file
diff --git a/songs/ms20_patch_bay.py b/songs/ms20_patch_bay.py
new file mode 100644
index 00000000..11f318c7
--- /dev/null
+++ b/songs/ms20_patch_bay.py
@@ -0,0 +1,62 @@
+"""MS-20 Patch Bay — a 118 BPM tour of the SM-24 Mono's patch cords.
+
+Generate: PYTHONPATH=tools python3 songs/ms20_patch_bay.py
+Render:   ... --render
+
+Every part is an SM-24 Mono with cords in (PATCH page):
+  METAL    VCO2 a fifth up into LPF CUT at audio rate   patch-fm-metal-bass
+  BUBBLES  S&H on LPF CUT, clocked by the MG             patch-sh-bubbles
+  GROWL    VCA OUT back into FLT IN                      patch-feedback-growl
+  VOWEL    FENV on HPF CUT, both filters peaked          patch-vowel-sweep
+  LEAD     KBD tracking + MG vibrato                     patch-tracking-lead
+"""
+import argparse
+from slabkit import Song, fx
+
+song = Song("MS-20 Patch Bay", bpm=118, key="D minor")
+metal = song.section("METAL", 4)
+bubbles = song.section("BUBBLES", 4)
+growl = song.section("GROWL", 4)
+vowel = song.section("VOWEL", 8)
+
+kit = song.track("DRUMS", "drum2", "dry-punch-kit", volume=0.75,
+                 fx=[fx("comp2", "dry-drum-punch")])
+bass = song.track("METAL BASS", "ms20", "patch-fm-metal-bass", volume=0.7,
+                  fx=[fx("eq2", hpf_on="ON", hpf_hz=30)])
+bub = song.track("BUBBLES", "ms20", "patch-sh-bubbles", volume=0.55, pan=-0.3,
+                 fx=[fx("delay2", mix=0.25)])
+grr = song.track("GROWL", "ms20", "patch-feedback-growl", volume=0.55, pan=0.25,
+                 fx=[fx("verb2", mix=0.15)])
+vow = song.track("VOWEL", "ms20", "patch-vowel-sweep", volume=0.6, pan=0.15,
+                 fx=[fx("delay2", mix=0.2)])
+lead = song.track("LEAD", "ms20", "patch-tracking-lead", volume=0.6, pan=-0.1,
+                  fx=[fx("verb2", mix=0.2)])
+
+song.master(fx=[fx("comp2", "gentle-bus-glue"), fx("limiter2", gain=4, ceil=-1)])
+
+LINE = "D1! . D1 D2 . D1 F1 . D1! . C2 . A1 . G1 F1"
+for sec in (metal, bubbles, growl, vowel):
+    bass.clip(sec).seq(LINE, gate=0.5).repeat(4 if sec is not vowel else 8)
+    kit.clip(sec).drums({"kick": "x...x...x...x...",
+                         "snare": "....x.......x...",
+                         "ch": "x.xxx.x.x.xxx.x.",
+                         "oh": "......x.......x."}, bars=sec.bars)
+
+# long notes: the S&H bubbles under them
+for sec in (bubbles, growl, vowel):
+    bub.clip(sec).melody("D4:4 | F4:4 | A3:4 | C4:4")
+# the feedback loop swells on held notes
+grr.clip(growl).melody("D3:2 F3:2 | A3:3 G3:1 | F3:2 E3:2 | D3:4")
+# talking stabs, then the tracking lead over them
+vow.clip(vowel).seq("D3 . . D3 . . F3 . . . A3 . . . C4 . |"
+                    " D3 . . D3 . . F3 . . . G3 . . . E3 .", gate=0.6).repeat(4)
+lead.clip(vowel, bars=4, at_bar=4).melody("A4:1.5 G4:.5 F4:1 E4:1 | D4:2 F4:1 A4:1 | "
+                                          "C5:1.5 A4:.5 G4:1 F4:1 | E4:3 r:1")
+
+if __name__ == "__main__":
+    ap = argparse.ArgumentParser()
+    ap.add_argument("--render", action="store_true")
+    a = ap.parse_args()
+    song.save()
+    if a.render:
+        song.render()
diff --git a/songs/ms_20_patch_bay.slab/project.json b/songs/ms_20_patch_bay.slab/project.json
new file mode 100644
index 00000000..5acfbae5
--- /dev/null
+++ b/songs/ms_20_patch_bay.slab/project.json
@@ -0,0 +1,4422 @@
+{
+ "slab": "project",
+ "schema": 1,
+ "transport": {
+  "bpm": 118.0,
+  "loop": {
+   "on": false,
+   "start": 0.0,
+   "end": 80.0
+  }
+ },
+ "meter": [
+  {
+   "bar": 0,
+   "num": 4,
+   "den": 4
+  }
+ ],
+ "sections": [
+  {
+   "beat": 0.0,
+   "name": "METAL",
+   "color": 4
+  },
+  {
+   "beat": 16.0,
+   "name": "BUBBLES",
+   "color": 5
+  },
+  {
+   "beat": 32.0,
+   "name": "GROWL",
+   "color": 6
+  },
+  {
+   "beat": 48.0,
+   "name": "VOWEL",
+   "color": 7
+  }
+ ],
+ "end": 80.0,
+ "tracks": [
+  {
+   "name": "DRUMS",
+   "color": [
+    230,
+    90,
+    120
+   ],
+   "volume": 0.75,
+   "pan": 0.0,
+   "mute": false,
+   "solo": false,
+   "instrument": {
+    "machine": "drum2",
+    "params": {
+     "kick-tune": 54,
+     "kick-sweep": 5,
+     "kick-bend": 0.04,
+     "kick-decay": 0.24,
+     "kick-click": 0.45,
+     "kick-drive": 1.5,
+     "kick-level": 0.9,
+     "snare-tune": 205,
+     "snare-decay": 0.13,
+     "snare-snap": 0.7,
+     "snare-sdec": 0.08,
+     "snare-tone": 2600,
+     "snare-level": 0.85,
+     "clap-tone": 1200,
+     "clap-spread": 0.01,
+     "clap-decay": 0.14,
+     "clap-level": 0.8,
+     "hat-tune": 1.05,
+     "hat-tone": 1.3,
+     "hat-chdec": 0.035,
+     "hat-ohdec": 0.4,
+     "hat-level": 0.85,
+     "tom-tune": 120,
+     "tom-sweep": 1.2,
+     "tom-decay": 0.25,
+     "tom-drive": 1.4,
+     "tom-level": 0.82,
+     "master-accent": 0.55,
+     "master-drive": 1.2,
+     "master-level": 0.9
+    },
+    "preset": "dry-punch-kit"
+   },
+   "effects": [
+    {
+     "machine": "comp2",
+     "params": {
+      "comp-thresh": -15.8,
+      "comp-ratio": 4,
+      "comp-knee": 4,
+      "comp-atk": 0.01,
+      "comp-rel": 0.06,
+      "comp-hpf": 20,
+      "comp-det": 0,
+      "comp-makeup": 3.4,
+      "comp-mix": 1
+     },
+     "bypass": false,
+     "preset": "dry-drum-punch"
+    }
+   ],
+   "clips": [
+    {
+     "type": "note",
+     "name": "METAL",
+     "start": 0.0,
+     "len": 16.0,
+     "notes": [
+      {
+       "pitch": 36,
+       "start": 0.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 0.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 0.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 0.75,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 1.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 38,
+       "start": 1.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 1.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 1.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 46,
+       "start": 1.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 2.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 2.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 2.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 2.75,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 3.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 38,
+       "start": 3.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 3.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 3.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 46,
+       "start": 3.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 4.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 4.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 4.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 4.75,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 5.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 38,
+       "start": 5.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 5.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 5.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 46,
+       "start": 5.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 6.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 6.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 6.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 6.75,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 7.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 38,
+       "start": 7.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 7.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
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+       "start": 28.0,
+       "len": 0.15,
+       "vel": 96
+      },
+      {
+       "pitch": 50,
+       "start": 28.75,
+       "len": 0.15,
+       "vel": 96
+      },
+      {
+       "pitch": 53,
+       "start": 29.5,
+       "len": 0.15,
+       "vel": 96
+      },
+      {
+       "pitch": 57,
+       "start": 30.5,
+       "len": 0.15,
+       "vel": 96
+      },
+      {
+       "pitch": 60,
+       "start": 31.5,
+       "len": 0.15,
+       "vel": 96
+      }
+     ]
+    }
+   ]
+  },
+  {
+   "name": "LEAD",
+   "color": [
+    240,
+    130,
+    70
+   ],
+   "volume": 0.6,
+   "pan": -0.1,
+   "mute": false,
+   "solo": false,
+   "instrument": {
+    "machine": "ms20",
+    "params": {
+     "vco1-wave": 1,
+     "vco-octave": 3,
+     "vco2-wave": 1,
+     "vco2-octave": 2,
+     "detune": 0.08,
+     "pulse-width": 0.7,
+     "saw-level": 0.8,
+     "pulse-level": 0.5,
+     "noise-level": 0,
+     "hpf-cutoff": 20,
+     "hpf-resonance": 0,
+     "cutoff": 900,
+     "resonance": 1.2,
+     "drive": 1.2,
+     "lpf-mode": 2,
+     "env-amount": 1.5,
+     "level": 0.4,
+     "amp-attack": 0.002,
+     "amp-decay": 0.4,
+     "amp-sustain": 0.9,
+     "amp-release": 0.25,
+     "filter-attack": 0.002,
+     "filter-decay": 0.5,
+     "filter-sustain": 0.4,
+     "filter-release": 0.15,
+     "mg-freq": 5.5,
+     "mg-wave": 0.5,
+     "mg-pitch": 0,
+     "mg-pw": 0,
+     "mg-cutoff": 0,
+     "eg-pitch": 0,
+     "age": 0.4,
+     "portamento": 0.06,
+     "filter-delay": 0,
+     "amp-hold": 0,
+     "ms20-c1-src": 8,
+     "ms20-c1-dst": 5,
+     "ms20-c1-amt": 0.2,
+     "ms20-c2-src": 4,
+     "ms20-c2-dst": 1,
+     "ms20-c2-amt": 0.006,
+     "ms20-c3-src": 10,
+     "ms20-c3-dst": 5,
+     "ms20-c3-amt": 0.3,
+     "ms20-c4-src": 0,
+     "ms20-c4-dst": 0,
+     "ms20-c4-amt": 0.0
+    },
+    "preset": "patch-tracking-lead"
+   },
+   "effects": [
+    {
+     "machine": "verb2",
+     "params": {
+      "verb-mix": 0.2
+     },
+     "bypass": false
+    }
+   ],
+   "clips": [
+    {
+     "type": "note",
+     "name": "VOWEL",
+     "start": 64.0,
+     "len": 16.0,
+     "notes": [
+      {
+       "pitch": 69,
+       "start": 0.0,
+       "len": 1.425,
+       "vel": 100
+      },
+      {
+       "pitch": 67,
+       "start": 1.5,
+       "len": 0.475,
+       "vel": 100
+      },
+      {
+       "pitch": 65,
+       "start": 2.0,
+       "len": 0.95,
+       "vel": 100
+      },
+      {
+       "pitch": 64,
+       "start": 3.0,
+       "len": 0.95,
+       "vel": 100
+      },
+      {
+       "pitch": 62,
+       "start": 4.0,
+       "len": 1.9,
+       "vel": 100
+      },
+      {
+       "pitch": 65,
+       "start": 6.0,
+       "len": 0.95,
+       "vel": 100
+      },
+      {
+       "pitch": 69,
+       "start": 7.0,
+       "len": 0.95,
+       "vel": 100
+      },
+      {
+       "pitch": 72,
+       "start": 8.0,
+       "len": 1.425,
+       "vel": 100
+      },
+      {
+       "pitch": 69,
+       "start": 9.5,
+       "len": 0.475,
+       "vel": 100
+      },
+      {
+       "pitch": 67,
+       "start": 10.0,
+       "len": 0.95,
+       "vel": 100
+      },
+      {
+       "pitch": 65,
+       "start": 11.0,
+       "len": 0.95,
+       "vel": 100
+      },
+      {
+       "pitch": 64,
+       "start": 12.0,
+       "len": 2.85,
+       "vel": 100
+      }
+     ]
+    }
+   ]
+  }
+ ],
+ "master": {
+  "volume": 1.0,
+  "pan": 0.0,
+  "subsonic": false,
+  "effects": [
+   {
+    "machine": "comp2",
+    "params": {
+     "comp-thresh": -14.1,
+     "comp-ratio": 2,
+     "comp-knee": 9,
+     "comp-atk": 0.03,
+     "comp-rel": 0.2,
+     "comp-hpf": 90,
+     "comp-det": 0,
+     "comp-makeup": 1.3,
+     "comp-mix": 1
+    },
+    "bypass": false,
+    "preset": "gentle-bus-glue"
+   },
+   {
+    "machine": "limiter2",
+    "params": {
+     "lim-gain": 4,
+     "lim-ceil": -1
+    },
+    "bypass": false
+   }
+  ]
+ }
+}
\ No newline at end of file
diff --git a/songs/squelch_acid.py b/songs/squelch_acid.py
new file mode 100644
index 00000000..615a5b71
--- /dev/null
+++ b/songs/squelch_acid.py
@@ -0,0 +1,54 @@
+"""Squelch Acid — a 128 BPM acid track for the Squelch 33.
+
+Generate: PYTHONPATH=tools python3 songs/squelch_acid.py
+Render:   ... --render
+
+The line plays alone with CUT closed, the 909 comes in and the filter
+opens over eight bars while RES climbs toward the scream; the last
+section doubles it with a WET square an octave up, accents stacking.
+"""
+import argparse
+from slabkit import Song, fx
+
+song = Song("Squelch Acid", bpm=128, key="A minor")
+intro = song.section("LINE", 4)
+build = song.section("OPENING", 8)
+peak = song.section("WOW", 8)
+
+kit = song.track("909", "drum2", "909-punch", volume=0.8,
+                 fx=[fx("comp2", "dry-drum-punch")])
+acid = song.track("SQUELCH", "acid", "classic-squelch", volume=0.75,
+                  fx=[fx("delay2", "dotted-eighth-lead-120", mix=0.14)],
+                  params=dict(cutoff=140, resonance=0.55, env_mod=0.45, decay=0.4))
+sq = song.track("SQUARE", "acid", "square-bounce", volume=0.5, pan=0.2,
+                fx=[fx("verb2", mix=0.12)],
+                params=dict(mode="WET", resonance=0.85, cutoff=420, tune=12))
+
+song.master(fx=[fx("comp2", "gentle-bus-glue"), fx("limiter2", gain=4, ceil=-1)])
+
+# accents (!) and slides (~) make the line
+LINE = ("A1! . A1 A2~ A1 . C2! A1 . A1 G1~ A1 . A2! . E2 |"
+        " A1! . A1 A2~ A1 . C2! A1 . D2~ E2 . G2! . A1 A1")
+for sec in (intro, build, peak):
+    acid.clip(sec).seq(LINE, gate=0.5).repeat(8)
+sq.clip(peak).seq(LINE, gate=0.45).repeat(8)
+
+for sec in (build, peak):
+    kit.clip(sec).drums({"kick": "x...x...x...x...",
+                         "clap": "....x.......x...",
+                         "ch": "x.x.x.x.x.x.x.x.",
+                         "oh": "..x...x...x...x."}, bars=8)
+
+# the 303 move: open CUT and push RES by hand
+b0 = build.start * 4
+acid.ramp("cutoff", b0, b0 + 32, 140, 900, tension=-0.3)
+acid.ramp("resonance", b0, b0 + 32, 0.55, 0.9)
+acid.ramp("env_mod", b0, b0 + 32, 0.45, 0.7)
+
+if __name__ == "__main__":
+    ap = argparse.ArgumentParser()
+    ap.add_argument("--render", action="store_true")
+    a = ap.parse_args()
+    song.save()
+    if a.render:
+        song.render()
diff --git a/songs/squelch_acid.slab/project.json b/songs/squelch_acid.slab/project.json
new file mode 100644
index 00000000..c7217831
--- /dev/null
+++ b/songs/squelch_acid.slab/project.json
@@ -0,0 +1,3892 @@
+{
+ "slab": "project",
+ "schema": 1,
+ "transport": {
+  "bpm": 128.0,
+  "loop": {
+   "on": false,
+   "start": 0.0,
+   "end": 80.0
+  }
+ },
+ "meter": [
+  {
+   "bar": 0,
+   "num": 4,
+   "den": 4
+  }
+ ],
+ "sections": [
+  {
+   "beat": 0.0,
+   "name": "LINE",
+   "color": 4
+  },
+  {
+   "beat": 16.0,
+   "name": "OPENING",
+   "color": 5
+  },
+  {
+   "beat": 48.0,
+   "name": "WOW",
+   "color": 6
+  }
+ ],
+ "end": 80.0,
+ "tracks": [
+  {
+   "name": "909",
+   "color": [
+    230,
+    90,
+    120
+   ],
+   "volume": 0.8,
+   "pan": 0.0,
+   "mute": false,
+   "solo": false,
+   "instrument": {
+    "machine": "drum2",
+    "params": {
+     "kick-tune": 52,
+     "kick-sweep": 9,
+     "kick-bend": 0.045,
+     "kick-decay": 0.35,
+     "kick-click": 0.55,
+     "kick-drive": 2.6,
+     "kick-level": 0.9,
+     "snare-tune": 190,
+     "snare-decay": 0.14,
+     "snare-snap": 0.9,
+     "snare-sdec": 0.09,
+     "snare-tone": 2400,
+     "snare-level": 0.9,
+     "clap-tone": 1300,
+     "clap-spread": 0.009,
+     "clap-decay": 0.22,
+     "clap-level": 0.9,
+     "hat-tune": 1.1,
+     "hat-tone": 1.25,
+     "hat-chdec": 0.05,
+     "hat-ohdec": 0.45,
+     "hat-level": 0.95,
+     "tom-tune": 120,
+     "tom-sweep": 1.6,
+     "tom-decay": 0.28,
+     "tom-drive": 1.6,
+     "tom-level": 0.85,
+     "master-accent": 0.8,
+     "master-drive": 1.6,
+     "master-level": 0.9
+    },
+    "preset": "909-punch"
+   },
+   "effects": [
+    {
+     "machine": "comp2",
+     "params": {
+      "comp-thresh": -15.8,
+      "comp-ratio": 4,
+      "comp-knee": 4,
+      "comp-atk": 0.01,
+      "comp-rel": 0.06,
+      "comp-hpf": 20,
+      "comp-det": 0,
+      "comp-makeup": 3.4,
+      "comp-mix": 1
+     },
+     "bypass": false,
+     "preset": "dry-drum-punch"
+    }
+   ],
+   "clips": [
+    {
+     "type": "note",
+     "name": "OPENING",
+     "start": 16.0,
+     "len": 32.0,
+     "notes": [
+      {
+       "pitch": 36,
+       "start": 0.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 0.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 0.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 46,
+       "start": 0.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 1.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 39,
+       "start": 1.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 1.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 1.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 46,
+       "start": 1.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 2.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 2.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 2.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 46,
+       "start": 2.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 3.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 39,
+       "start": 3.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 3.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 3.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 46,
+       "start": 3.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 4.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 4.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 4.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 46,
+       "start": 4.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 5.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 39,
+       "start": 5.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 5.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 5.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 46,
+       "start": 5.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 6.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 6.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 42,
+       "start": 6.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 46,
+       "start": 6.5,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
+       "pitch": 36,
+       "start": 7.0,
+       "len": 0.1,
+       "vel": 100
+      },
+      {
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+       "start": 7.0,
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+      },
+      {
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+      },
+      {
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+      {
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+      {
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+       "start": 8.0,
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+      {
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+      },
+      {
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+      },
+      {
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+       "start": 8.5,
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+      },
+      {
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+       "start": 9.0,
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+      {
+       "pitch": 39,
+       "start": 9.0,
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+      },
+      {
+       "pitch": 42,
+       "start": 9.0,
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+      },
+      {
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+       "start": 9.5,
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+      },
+      {
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+      {
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+      {
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+      {
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+      },
+      {
+       "pitch": 33,
+       "start": 15.75,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 16.0,
+       "len": 0.1125,
+       "vel": 124
+      },
+      {
+       "pitch": 33,
+       "start": 16.5,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 45,
+       "start": 16.75,
+       "len": 0.275,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 17.0,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 36,
+       "start": 17.5,
+       "len": 0.1125,
+       "vel": 124
+      },
+      {
+       "pitch": 33,
+       "start": 17.75,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 18.25,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 31,
+       "start": 18.5,
+       "len": 0.275,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 18.75,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 45,
+       "start": 19.25,
+       "len": 0.1125,
+       "vel": 124
+      },
+      {
+       "pitch": 40,
+       "start": 19.75,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 20.0,
+       "len": 0.1125,
+       "vel": 124
+      },
+      {
+       "pitch": 33,
+       "start": 20.5,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 45,
+       "start": 20.75,
+       "len": 0.275,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 21.0,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 36,
+       "start": 21.5,
+       "len": 0.1125,
+       "vel": 124
+      },
+      {
+       "pitch": 33,
+       "start": 21.75,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 38,
+       "start": 22.25,
+       "len": 0.275,
+       "vel": 96
+      },
+      {
+       "pitch": 40,
+       "start": 22.5,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 43,
+       "start": 23.0,
+       "len": 0.1125,
+       "vel": 124
+      },
+      {
+       "pitch": 33,
+       "start": 23.5,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 23.75,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 24.0,
+       "len": 0.1125,
+       "vel": 124
+      },
+      {
+       "pitch": 33,
+       "start": 24.5,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 45,
+       "start": 24.75,
+       "len": 0.275,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 25.0,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 36,
+       "start": 25.5,
+       "len": 0.1125,
+       "vel": 124
+      },
+      {
+       "pitch": 33,
+       "start": 25.75,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 26.25,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 31,
+       "start": 26.5,
+       "len": 0.275,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 26.75,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 45,
+       "start": 27.25,
+       "len": 0.1125,
+       "vel": 124
+      },
+      {
+       "pitch": 40,
+       "start": 27.75,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 28.0,
+       "len": 0.1125,
+       "vel": 124
+      },
+      {
+       "pitch": 33,
+       "start": 28.5,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 45,
+       "start": 28.75,
+       "len": 0.275,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 29.0,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 36,
+       "start": 29.5,
+       "len": 0.1125,
+       "vel": 124
+      },
+      {
+       "pitch": 33,
+       "start": 29.75,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 38,
+       "start": 30.25,
+       "len": 0.275,
+       "vel": 96
+      },
+      {
+       "pitch": 40,
+       "start": 30.5,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 43,
+       "start": 31.0,
+       "len": 0.1125,
+       "vel": 124
+      },
+      {
+       "pitch": 33,
+       "start": 31.5,
+       "len": 0.1125,
+       "vel": 96
+      },
+      {
+       "pitch": 33,
+       "start": 31.75,
+       "len": 0.1125,
+       "vel": 96
+      }
+     ]
+    }
+   ]
+  }
+ ],
+ "master": {
+  "volume": 1.0,
+  "pan": 0.0,
+  "subsonic": false,
+  "effects": [
+   {
+    "machine": "comp2",
+    "params": {
+     "comp-thresh": -14.1,
+     "comp-ratio": 2,
+     "comp-knee": 9,
+     "comp-atk": 0.03,
+     "comp-rel": 0.2,
+     "comp-hpf": 90,
+     "comp-det": 0,
+     "comp-makeup": 1.3,
+     "comp-mix": 1
+    },
+    "bypass": false,
+    "preset": "gentle-bus-glue"
+   },
+   {
+    "machine": "limiter2",
+    "params": {
+     "lim-gain": 4,
+     "lim-ceil": -1
+    },
+    "bypass": false
+   }
+  ]
+ }
+}
\ No newline at end of file
diff --git a/src/machine_desc.zig b/src/machine_desc.zig
index 01416e47..e0b1f364 100644
--- a/src/machine_desc.zig
+++ b/src/machine_desc.zig
@@ -1148,14 +1148,16 @@ test "descriptor walker reads the MS-20 manifest from fy" {
     try testing.expectEqualStrings("k-ms20-voice-sample", d.renderWord());
     try testing.expect(d.prepareWord() == null);
     try testing.expectEqualStrings("ms20-block-prepare", d.blockPrepareWord().?);
-    try testing.expectEqual(@as(usize, 712), d.state_size);
-    try testing.expectEqual(@as(usize, 576), d.params_size);
+    try testing.expectEqual(@as(usize, 928), d.state_size);
+    try testing.expectEqual(@as(usize, 768), d.params_size);
     try testing.expectEqual(@as(f32, 940.0), d.panel_w);
-    try testing.expectEqual(@as(usize, 35), d.control_count);
-    try testing.expectEqual(@as(usize, 10), d.strip_count);
-    try testing.expectEqual(@as(usize, 1), d.display_count);
-    try testing.expectEqual(@as(usize, 2), d.row_count);
-    try testing.expectEqual(@as(usize, 6), d.rows[0].cell_count);
+    try testing.expectEqual(@as(usize, 47), d.control_count);
+    try testing.expectEqual(@as(usize, 14), d.strip_count);
+    try testing.expectEqual(@as(usize, 4), d.display_count);
+    try testing.expectEqual(@as(usize, 0), d.row_count);
+    try testing.expectEqual(@as(usize, 2), d.page_count);
+    try testing.expectEqualStrings("PANEL", d.pages[0].nameSlice());
+    try testing.expectEqualStrings("PATCH", d.pages[1].nameSlice());
     try testing.expectEqual(@as(usize, 0), d.const_count);
 
     // First control: VCO1 WAVE switch at the introspected vco1-wave offset.
@@ -1172,7 +1174,7 @@ test "descriptor walker reads the MS-20 manifest from fy" {
         if (std.mem.eql(u8, ctl.idSlice(), "cutoff")) {
             try testing.expectEqual(@as(usize, 32), ctl.offset);
             try testing.expectEqual(ParamCurve.exp, ctl.curve);
-            try testing.expectApproxEqAbs(@as(f64, 700.0), ctl.default, 1e-12);
+            try testing.expectApproxEqAbs(@as(f64, 1200.0), ctl.default, 1e-12);
             found = true;
         }
     }
diff --git a/src/machine_registry.zig b/src/machine_registry.zig
index ca23e915..6443738e 100644
--- a/src/machine_registry.zig
+++ b/src/machine_registry.zig
@@ -44,6 +44,7 @@ test {
 /// walks the same list.
 pub const builtin_machines = [_][]const u8{
     "machines/ms20/ms20.fy",
+    "machines/acid/acid.fy",
     "machines/cream/cream.fy",
     "machines/fm86/fm86.fy",
     "machines/drum2/drum2.fy",
@@ -409,8 +410,8 @@ test "fy manifest loads MS-20 machine entry" {
     try std.testing.expectEqual(@as(?usize, null), reg.findById("nope"));
     try std.testing.expect(e.in_notes);
     try std.testing.expect(!e.in_audio);
-    try std.testing.expectEqual(@as(usize, 712), e.raw_state_size);
-    try std.testing.expectEqual(@as(usize, 576), e.params_size);
+    try std.testing.expectEqual(@as(usize, 928), e.raw_state_size);
+    try std.testing.expectEqual(@as(usize, 768), e.params_size);
     try std.testing.expectEqual(@as(f32, 940.0), e.panel_w);
 }
 
diff --git a/src/machines/fy_raw_machine.zig b/src/machines/fy_raw_machine.zig
index 9d8d7c76..6b1f428d 100644
--- a/src/machines/fy_raw_machine.zig
+++ b/src/machines/fy_raw_machine.zig
@@ -7019,13 +7019,23 @@ test "MS-20 block-prepare derives the LPF, HPF and envelope coefficients in fy"
     const drive = inst.readParamF64(try fyFieldOffset(inst, "Ms20VoiceParams.drive"));
     const hres = inst.readParamF64(try fyFieldOffset(inst, "Ms20VoiceParams.hpf-resonance"));
     // Defaults land raw: env amount in octaves, resonance and drive knobs.
-    try testing.expectApproxEqAbs(@as(f64, 4.8), inst.readParamF64(try fyFieldOffset(inst, "Ms20VoiceParams.env-amount")), 1e-6); // knobs store f32 positions
-    // LPF profile, HOT mode: drive 2.1 x DRV, feedback 10.125 x 0.8 RES,
-    // damping 0.62 / (1 + 5.2 x 0.8 RES); the LPF runs at 4x.
+    try testing.expectApproxEqAbs(@as(f64, 2.0), inst.readParamF64(try fyFieldOffset(inst, "Ms20VoiceParams.env-amount")), 1e-6); // knobs store f32 positions
+    // The default MODE is K35 [2]: its profile [ms20_sk.fy] has base damping
+    // 7/3, drive 0.9 x DRV, and loop gain a [1 - u^2], u = 1 - [RES/2] / 0.9.
+    try testing.expectApproxEqAbs(@as(f64, 2.0), inst.readParamF64(try fyFieldOffset(inst, "Ms20VoiceParams.lpf-mode")), 1e-12);
+    const sk = try fyFieldOffset(inst, "Ms20VoiceParams.sk-pr");
+    const a_k35: f64 = 7.0 / 3.0;
+    const u_lp = 1.0 - 0.5 * res / 0.9;
+    try testing.expectApproxEqAbs(a_k35, inst.readParamF64(sk + try fyFieldOffset(inst, "Ms20SkProfile.a")), 1e-12);
+    try testing.expectApproxEqAbs(0.9 * drive, inst.readParamF64(sk + try fyFieldOffset(inst, "Ms20SkProfile.drive")), 1e-12);
+    try testing.expectApproxEqAbs(a_k35 * (1.0 - u_lp * u_lp), inst.readParamF64(sk + try fyFieldOffset(inst, "Ms20SkProfile.k-lp")), 1e-12);
+    // The acid pair's profile [ms20_lpf.fy] is derived in every mode; any
+    // MODE but HOT takes WET's numbers: drive 1.9 x DRV, feedback
+    // 14.58 x 0.8 RES, damping 0.58 / (1 + 6.2 x 0.8 RES); the LPF runs at 4x.
     const pr = try fyFieldOffset(inst, "Ms20VoiceParams.lpf-pr");
-    try testing.expectApproxEqAbs(2.1 * drive, inst.readParamF64(pr + try fyFieldOffset(inst, "Ms20LpfProfile.drive")), 1e-12);
-    try testing.expectApproxEqAbs(10.125 * 0.8 * res, inst.readParamF64(pr + try fyFieldOffset(inst, "Ms20LpfProfile.fb-amt")), 1e-12);
-    try testing.expectApproxEqAbs(@max(0.035, 0.62 / (1.0 + 5.2 * 0.8 * res)), inst.readParamF64(pr + try fyFieldOffset(inst, "Ms20LpfProfile.damping")), 1e-12);
+    try testing.expectApproxEqAbs(1.9 * drive, inst.readParamF64(pr + try fyFieldOffset(inst, "Ms20LpfProfile.drive")), 1e-12);
+    try testing.expectApproxEqAbs(14.58 * 0.8 * res, inst.readParamF64(pr + try fyFieldOffset(inst, "Ms20LpfProfile.fb-amt")), 1e-12);
+    try testing.expectApproxEqAbs(@max(0.035, 0.58 / (1.0 + 6.2 * 0.8 * res)), inst.readParamF64(pr + try fyFieldOffset(inst, "Ms20LpfProfile.damping")), 1e-12);
     try testing.expectApproxEqAbs(4.0 * 48_000.0, inst.readParamF64(try fyFieldOffset(inst, "Ms20VoiceParams.osr")), 1e-9);
     // HPF damping 1.4 (1 - RES/2)^2.
     const u = @max(0.0, 1.0 - 0.5 * hres);