termus

termus is a terminal-native generative music instrument. It can run live for hours, render long-form pieces to disk, build playlists, export stems and MIDI, and surface deeper controls through a minimal TUI plus a control center.

• Live stations with curated identities like Night Drift, Soft Tape, and Dusty Swing
• Long-form listening modes: endless, album-side, hour-stream, and radio
• Live playback, direct WAV rendering, playlist rendering, stems, and MIDI export
• Minimal play view with a deeper control center for music, seeds, library, export, audio, and debug

Quick Start

go install github.com/mrbrutti/termus/cmd/termus@latest
termus

Or from source:

git clone https://github.com/mrbrutti/termus
cd termus
go run ./cmd/termus

Sample invocations:

# Default live station
termus

# Long-form jazz station with preferred per-algorithm SoundFonts
termus --algo jazz --listen-mode hour-stream --sf2-strategy pro

# Render an album-side ambient piece to disk
termus --algo ambient --listen-mode album-side --out ambient-side-a.wav

# Render a radio-style mixed playlist with WAVs + manifest
termus --listen-mode radio --playlist-out ./radio-set

# Render stems and MIDI when supported
termus --algo lofi --out soft-tape.wav --stems --midi

Stations And Algorithms

The CLI still uses genre-style --algo names. The TUI and playlists surface curated station labels, and the top bar / control center show both where useful, for example Night Drift · ambient.

--algo	Station label	Character	Synth fallback
ambient	Night Drift	Slow ambient chord drift, bells, and hovering textures	ambient-synth
drone	Deep Field	Sustained low-motion beds and metallic shimmer	drone-synth
bells	Glass Chapel	Bright bells, celesta-like figures, reflective space	bells-synth
lullaby	Sleep Walk	Pentatonic lullaby textures that stay consonant	lullaby-synth
classical	Chamber Loop	Chamber-like melodic writing and evolving form	classical-synth
phase	Slow Signal	Reich-style phased motion and repeating pattern drift	sampled only
lofi	Soft Tape	Beat-driven tape-warm grooves and melodic pocket	sampled only
jazz	Dusty Swing	Walking bass, comping, drums, and lead phrasing	sampled only

Notes:

• Legacy names such as eno, chill, glass, markov-sf2, and sf2 still resolve.
• The sampled algorithms can run with a curated SoundFont preset or your own .sf2 file.
• The long-form engine now evolves by episode and movement instead of short fixed loops.

Engines

termus has two render engines. The engine is selected per-track in the .tm file via the render_engine: field.

render_engine:	Description
sf2 (default, or unset)	The original procedural engine. Authored compiler + algorithmic generators + SoundFont sampler. Pure Go. No external dependencies beyond bundled .sf2 files. Used by every track up through v2 of the .tm schema and remains the default.
acestep (opt-in, SP21)	AI generation via the ACE-Step diffusion model running in a local Python service. Streaming playback with look-ahead queueing and equal-power crossfade between successive renders. Auto-bootstrapped on first use (uv + Python 3.11 + venv + ~9.4 GB model) when you run termus --track <v3.tm>. Use termus --acestep-install to set up ahead of time, or --acestep-service-url <url> to connect to an externally-managed daemon.

Old tracks with no render_engine: field continue to compile and render unchanged on the SF2 path. The ACE-Step path is documented in docs/acestep-engine.md; the reference v3 track is tracks/lofi/bookstore-rainy-night-v3.tm.

Listening Modes

Listening modes shape the session profile and some export defaults.

--listen-mode	What it does
endless	Default live mode. Single evolving stream. Offline --out defaults to 180 seconds.
album-side	Longer, more deliberate arc. Offline --out defaults to 24 minutes.
hour-stream	One continuous hour-scale piece. Offline --out defaults to 60 minutes.
radio	Auto-configures a mixed playlist feel. Defaults to --playlist mixed, 8 tracks, ~7m30s per track.

Notes:

• --listen-mode radio works for live playback and --playlist-out.
• --listen-mode radio is not valid with direct single-file --out.

CLI Options

Core playback

Flag	Description
--algo NAME	Select algorithm/station source.
--seed N	Set deterministic seed. Same seed recreates the same starting world.
--volume 0..100	Initial live/output volume.
--listen-mode MODE	endless, album-side, hour-stream, radio.
--debug	Start the TUI with the musical debug inspector visible.

Sound and space

Flag	Description
--sf2 PATH	Use a custom SoundFont file. Overrides preset selection.
--sf2-preset NAME	Choose a curated preset such as general or sgm.
--sf2-strategy single|pro|max	single uses one preset everywhere, pro loads each algorithm's preferred preset, and max preloads the full curated SoundFont catalog.
--ir room|hall|cathedral|plate|PATH	Apply convolution reverb from a preset or WAV impulse response.
--ir-wet 0..1	Wet mix for --ir.

Playlists and rendering

Flag	Description
--playlist same|mixed	Live or batch playlist mode. same varies seeds of the chosen algorithm; mixed rotates genres.
--playlist-tracks N	Playlist length.
--playlist-duration DURATION	Per-track duration before crossfade.
--out FILE.wav	Render one piece to a WAV instead of starting live playback.
--seconds N	Duration for --out. If omitted, the listening mode default is used.
--playlist-out DIR	Render a playlist to a directory of WAVs plus manifest.json.
--stems	With --out or --playlist-out, also export per-stem WAVs when supported.
--midi	With --out or --playlist-out, also export MIDI when supported.

TUI Model

The live app now has a two-layer model:

1. Play view: visualizer first, minimal chrome.
2. Control center: the place for nearly everything deeper.

Global keys

Key	Action
space	Play / pause
↑ ↓ + -	Volume up / down
m	Open or close the control center
?	Open or close help
q or Ctrl-C	Quit

The footer intentionally stays minimal. Most other actions live in the control center instead of the main play view.

Power-user note:

• Older direct shortcuts still work even though they are no longer advertised in the footer. If you already know keys like c, C, n, p, d, l, i, e, z, [, ], a, b, tab, k, or x, you can still use them directly.

Control center

Inside the control center:

• ↑ ↓ browse rows
• ← → adjust the current value
• Enter apply, toggle, or open
• Tab move to the next section

Sections:

• Now: playback, listening mode summary, track status, recording, playlist skip
• Look: visual mode, theme, chrome, help state
• Music: density, brightness, motion, reverb, swing, drone depth, tempo, phrase length, seed morph
• Seeds: algorithm switching, seed browsing, A/B slots, compare, keep, reject
• Library: saved seeds, rating, favorites, tags, recent history, best takes, saved sessions
• Export: 60-second live export drawer for WAV, MIDI, stems, and recording control
• Audio: backend status, retry live audio, render-only fallback
• Debug: toggle overlay plus bar / section / chord / preset state

Help, chrome, and debug

• ? shows the current two-layer help overlay.
• The debug overlay can be toggled from the control center or enabled on startup with --debug.
• Reduced chrome / zen behavior is handled through the Look section instead of adding more always-visible keys.

Visualizers And Themes

Current visual modes:

• scope: the default thin waveform trace
• contour: a center-weighted spectral horizon
• vector: an expanded stereo phase portrait
• signal: a termus-native carrier trace with restrained ghost echoes
• drift: string-like horizontal vibration lines

Current themes:

• indigo
• amber
• matrix
• magenta
• mono
• rainbow

The non-default visualizers use the same minimal braille line language as the default view, with pulse-based color breathing and smoother visual transitions.

Rendering And Export

Direct offline renders

termus --algo ambient --out piece.wav
termus --algo jazz --listen-mode album-side --out side-b.wav
termus --algo lofi --out beat.wav --stems --midi

Behavior:

• --out writes one WAV file.
• --seconds controls duration unless the listening mode supplies a longer default.
• When possible, renders snap to a nearby cadence/outro instead of hard-cutting.
• --stems writes a sibling -stems/ directory.
• --midi writes a sibling .mid file when the algorithm supports MIDI capture/export.

Playlist renders

termus --playlist same --algo bells --playlist-out ./bells-set
termus --listen-mode radio --playlist-out ./radio-set --stems --midi

Behavior:

• --playlist-out renders one file per track.
• A manifest.json is written alongside the audio.
• --stems and --midi can be added for per-track artifacts when supported.

In-TUI export drawer

The live app also has a built-in export drawer in the control center:

• WAV export
• MIDI export
• stem export
• live recording toggle

Live exports currently render 60-second artifacts into ./exports/.

Seeds, Library, And Sessions

The app now includes built-in curation tools:

• browse seeds for the current algorithm
• store A/B seeds and compare them
• keep or reject takes
• rate and favorite seeds
• tag seeds
• browse recent history and best takes
• save and reload sessions that capture algo, seed, visual, theme, volume, and related state

This makes termus usable as a real exploration and capture workflow, not only a passive generator.

SoundFonts

If you use sampled algorithms, termus can auto-download curated SoundFonts into your user cache directory on first use.

Preset	Size	Best for
general	32 MB	Balanced default GM bank
sgm	325 MB	Piano, guitar, bass, and warm groove work
tyros4	502 MB	Jazz brass, sax, show-band color
dsound4	553 MB	Large balanced alternative
fatboy	315 MB	Loudness-matched GM, clean lo-fi / baroque
timbres-of-heaven	377 MB	Classical / orchestral writing
merlin-symphony	163 MB	Alternate orchestral bank
fairy-tale	200 MB	Bells, celesta, lullaby palettes
fm-dx	124 MB	FM textures for drone / phase
musescore-general	208 MB	Polite neutral GM
arachno	148 MB	Retro pad / bell / lead color

Recommended:

termus --sf2-strategy pro
termus --sf2-strategy max

• pro loads the preferred preset for each sampled algorithm.
• max preloads the entire curated catalog for instant switching and experimentation.

Reverb / IR Presets

--ir accepts either a preset name or a WAV path:

Value	Description
room	Tight early reflections
hall	Concert-hall tail
cathedral	Long, spacious tail
plate	Dense synthetic plate
PATH.wav	Custom 16-bit PCM WAV impulse response

How It Works

termus combines several layers:

• algorithm-specific note and phrase generation
• long-form episode and movement planning
• anti-repetition memory
• voice-leading, motif recall, and arrangement changes
• live TUI state and export tooling

Under the hood it uses:

• pure synthesis for the synth variants
• go-meltysynth for sampled SoundFont playback
• optional convolution reverb
• Bubble Tea + Lip Gloss for the TUI
• braille-grid rendering for the visual system

Dependencies

Library	License	Purpose
gopxl/beep/v2	MIT	Audio output and streaming
charmbracelet/bubbletea	MIT	TUI framework
charmbracelet/lipgloss	MIT	Terminal styling
sinshu/go-meltysynth	MIT	Pure-Go SoundFont synthesizer
madelynnblue/go-dsp	BSD	FFT support for DSP / visuals

License

MIT — see LICENSE.