Via CDM: http://cdm.link/2018/09/granular-convolver-tatsuya/ "The important thing: this Raspberry Pi-powered device feels amazing, like a heavyweight metal luxury item, and makes wonderful sounds. The basic operation: 1. Record a sound snippet. 2. Play back that sound snippet via a granular engine. 3. Convolve that playback with a live input, combining the two sounds – the timbre of your original sound, the envelope of what you’re playing now. There are also some features for storing and recalling presets, which make this performance friendly."