The Stargazer Drone Synth - An Isolationists Dream : Ask.Audio
Drone Synth - Layout and schematic update over the hand drawn one from earlier, based on LMNC oscillator w/filter. Curios what other ideas to add to this, I have seen capacitor switching
Elmyra Drone Synthesizer from Neutral Labs on Tindie
Moffenzeef Modular The Runner Limited Edition Desktop Drone Synthesize – Chicago Music Exchange