synthesizer

Geonkick is a free software synthesizer capable of generating a wide range of percussive sounds, including kicks, snares, claps, hi-hats, shakers, and also unique effect sounds. - https://geonkick.org

4-channel pulse wave MIDI synthesizer for ATmega640/1280/2560

Innovation-first digital audio workstation (DAW), instrument and effect plugins, wave editor

Arduino based crank/cam wheel signal generator