This is a polymorphic Arduino synth circuit board. Or two, actually. One takes up to four gates or triggers and up to four control voltages, and puts out up to two gates or triggers and two control voltages. Additional digital and analog inputs from panel components can be used too. How it gets from inputs to outputs is a matter of how the Arduino Nano is programmed. The other board, dac/ino lite, intended for use in external controllers, is set up for battery power and has reduced input and output capacity.

It’s based on the Synapse project by ShaduzLabs.

Schematics, KiCad design files, Gerbers, software, documentation