This is a drum machine based on Mutable Instruments' Grids and Peaks Eurorack modules. It runs on two Teensy development boards, one for each module.
See https://kbob.github.io/2016/06/27/i-made-this-drum-machine for details. Also, here's a video.
<iframe width="560" height="315" src="https://www.youtube.com/embed/p0GLgOOg_Dg" frameborder="0" allowfullscreen></iframe>This code is derived from Olivier Gillet's work, so it inherits his licenses and copyrights. Peaks is MIT licensed, and Grids is GPL3.0. See the source files for their respective copyright notices.