Back in late February, I had finished a project that involved building a 4 oscillators synth enclosed in a 3D-printed PETG enclosure. It is based on the unconventional use of an integrated circuit (the Hex-Schmidt Trigger), as described by Nicolas Collins in his Handmade Electronic Music book. I wanted to create a breadboard-like extension version of it, where you can plug in potentiometers, photoresistors, or other external inputs to control those oscillators.
