A 16-control subtractive synth for microcontrollers (39k ELF, web demo)

What it does

Play in your browser

A toy subtractive synth. Only 16 controls, surprisingly capable. Play with the controls to learn a little of sound design by practice. Most beginner synths greet you with 40–50 knobs; beeper has 16, picked to give a wide range of sounds without the clutter. beeper is written in C (~1,800 lines) for an ESP32 embedded project. This web version is the same code compiled to WASM. Two instrument tracks plus a simple drum track. No MIDI, no saving, no chord level polyphony: it is just a music toy with some potential for learning. Clone/fork for your game sound, or your own sequencer/DAW/whatever. MITfrom mini000.itch.io

In the maker’s words, at launch

This toy retro synth installs and runs on esp32-s3 or p4 as an ELF file under BreezyBox firmware. It uses my work-in-progress immediate mode TUI library in C. Web-based version via emscripten: https://mini000.itch.io/beeper Source code: https://github.com/valdanylchuk/beeper Demo…

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