B07SH18C9C Nandamonium DIY Kit

Low pulsing drones, dive bombs and high-pitched laser sounds!
Six tunable square wave oscillators and two level controls
Delay rate, mix, and feedback controls, with touch control over the rate and mix
Warp switch: adds a bright, “small” speaker tone
Blast switch: introduces max feedback into the circuit momentarily, great for adding rhythm and strange sounds