Trommel, or Drum is an inspiration by an open-source schematic called: “Shapeshifter.” By Fase Lunar. Check it out here.

Trommel is an Arduino Based drumcomputer. The “heart” of Trommel is the Teensy 3.6, a development board made by Adafruit. 

Update: Trommel has been printed on PCB. All the electronics are delivered aswell.