Here is a DOD Classic Tone I just circuit-bent. No extra knobs or switches. Basically, whatever you feed into it, it will distort and oscillator overtop of it. As you mess with the drive and tone controls, the oscillating distortion will begin to decimate or bit crush the signal. The knobs are touchy and you can get a huge variety of sounds by tweaking the knobs little by little. The quiet of a sound you feed through the pedal, the more range you have with the damage. It also works completely fine on it's own to produce crazy sounds. Some of the sounds are the pedal itself, another is a Rush song fed through it, and another is a silly voicemail from a friend.