Playable instruments, recallable patches.
MusicBrain is an open platform for playable instruments, recallable patches and musical control. Build and play modular patches in your browser, run shared DSP on a Teensy, and connect supported hardware through MIDI, CV, gates and relays.
Keep external audio paths analog where your setup allows it, or combine them with digital synthesis, sampling and effects. Recall depends on the parameters and connections your hardware can control.
One platform · three directions
for modular synthsCortex
Modular patches you can play and recall — in your browser, on a Teensy, and on supported modular hardware.
In developmentfor pedalboardsReflex
Relay loop switching for pedalboards, driven by a MIDI/footswitch controller. In development.
In developmentfor studiosRelay
Amp and cab switching for studios — architecture and safety requirements, not yet a verified design.
ConceptFresh from the bench
Latest release
firmware v0.5.113 · 2026-10-13
- HALL: a large Lexicon-style reverb with four algorithms (Hall, Room, Chamber, Random Hall) and Freeze
- 121 modules in the firmware/editor contract
Play it in your browser.
The editor & simulator is usable today: assemble a rack, patch instruments and effects, and play — no hardware or account needed. The simulator runs the Teensy firmware's own DSP code as WebAssembly, so a patch sounds nearly the same when you move it to a Teensy.
About the editor →Open, top to bottom.
MusicBrain's own firmware, editor, schematics and protocols are MIT-licensed; third-party libraries and assets keep their own licenses. No lock-in — extend it, port to it, fix it at 2 a.m. Source on GitHub.
Stay in the loop
Newsletter signup (double opt-in) is coming with the first beta. For now, watch the releases page — every update lands there first.