Chiptrack

A programmable cross-platform sequencer for the Game Boy Advance sound chip.

Features

Instruments are programmable

Each song carries a little WebAssembly program that converts sequenced notes to Game Boy Advance sound commands.
This gives almost complete control over the sound chip to each song.
Songs can be distributed and played from GitHub gists
Basic MIDI support in the desktop version
Runs natively on the Game Boy Advance

It can also be run on the 3DS through open_agb_firm
Master Sync Mode to send clock signals to a Pocket Operator or Volca

On the GBA the output volume is too low and it won't trigger unless amplified.

On the 3DS this can be worked around with open_agb_firm by setting audioOut=2 and volume=36 to override the physical volume slider.

Function	Desktop	Game Boy Advance
Move cursor	`←`\|`↑`\|`→`\|`↓`	`←`\|`↑`\|`→`\|`↓`
Switch panel (Patterns, Steps, Instruments)	`Shift` + (`←`\|`→`)	(`L`\|`R`) + (`←`\|`→`)
Select previous/next song pattern	`B` + (`↑`/`↓`)	`B` + (`↑`/`↓`)
Select previous/next pattern non-empty instruments	`Z` + (`←`/`→`)	`B` + (`←`/`→`)
Cycle the selected pattern/note/param value	`X` + (`←`\|`→`)	`A` + (`←`\|`→`)
Copy	`X`	`A`
Cut	`Z` + `X`	`B` + `A`
Paste (on empty slot)	`X`	`A`
Play song	`Enter`	`Start`
Play pattern	`Ctrl` + `Enter`	`Select` + `Start`
Reset sound channels	`Esc`	`Select`
Save	`Ctrl` + `S`	N/A
Export song to GBA save file	`Ctrl` + `G`	N/A
Toggle recording mode	`.`	N/A
Black notes	`W`\|`E`\|`T`\|`YU`	N/A
White notes	`A`\|`S`\|`D`\|`F`\|`G`\|`H`\|`J`\|`K`	N/A
Erase step (or hold during playback)	`Backspace`	N/A

Function	Desktop	Game Boy Advance
Cycle pattern	`X` + (`←`\|`→`)	`A` + (`←`\|`→`)
Duplicate pattern	`Shift` + (`Z`, `X`)	(`L`\|`R`) + (`B`, `A`)
Copy	`X`	`A`
Cut (only on the last non-empty slot )	`Z` + `X`	`B` + `A`
Paste (only on the placeholder slot)	`X`	`A`
Insert an empty pattern instead of pasting	`X`, `X`	`A`, `A`

Function	Desktop	Game Boy Advance
Cycle note/param	`X` + (`←`\|`→`)	`A` + (`←`\|`→`)
Cycle note/param (large amount)	`X` + (`↓`\|`↑`)	`A` + (`↓`\|`↑`)
Enter selection mode	`Shift` + `Z`	(`L`\|`R`) + `B`
Select all rows (in selection)	`Shift` + `Z`	(`L`\|`R`) + `B`
Copy (in selection)	`Z`	`B`
Cut (in or not in selection)	`Z` + `X`	`B` + `A`
Cancel selection	`Shift`	`L`\|`R`
Paste selection clipboard	`Shift` + `X`	(`L`\|`R`) + `A`
Paste edit clipboard (on empty slot)	`X`	`A`

Notes:

The source code is available under the terms of the MIT license (See LICENSE-MIT for details).

However, because of the use of GPL dependencies, Chiptrack compiled binaries are licensed under the terms of the GPLv3 (See LICENSE-GPL).