Arduino AMY / AMYchip device features TODO

[bwhitman]

We're supporting the following boards with the following features.

Each board should be programmable in Arduino, or with the relevant C SDK of the board.

We'll check ✅ these off as they get done, ❌ means not available on the board, empty means we will attempt to get to it and will update when it's done.

• seq: hardware timer for the sequencer
• i2s: I2S audio out
• audio_in : support for audio input on i2s or usb if supported
• usb_audio: plug the board into a computer as a USB audio device
• uart_midi: serial MIDI connection
• gadget_midi: USB midi connection that appears as a device to a host
• external RAM: support for SPIRAM / PSRAM for samples and effects
• multicore: ability to spread processing over two cores for polyphony
• polyphony: how many Juno-6 patch 0 notes the MCU can play at once (the AMY benchmark) (value in parens is Juno-6 patch 1 notes using the 2025-06-09 build)

board	MHz	seq	i2s	audio in	usb audio	uart midi	gadget midi	external RAM	multicore	polyphony
esp32	240				❌		❌	❌
esp32-s3	240	✅	✅	✅		✅		✅	✅	10 (11)
esp32-p4	360	✅	✅			✅			✅	20+ (26)
RP2040 @250 MHz	250	✅	✅			✅		❌	✅	6 (4)
RP2350 @250 MHz	250	✅	✅			✅			✅	8 (7)
teensy 4	600		✅		✅	✅			❌	15 (32+)
daisy seed	480	✅	built in	✅		✅		✅	❌	17 (21)
AMYboard	240	✅	✅	✅		✅	✅	✅	✅	10