This unit is two pedals in one. The left channel will activate the optical tremolo, with speed and depth knob controls. As well as a shape toggle switch, which allows you to go from smooth to choppy waveform.
The right channel will activate the silicon fuzz. A single fuzz (volume) knob.
Use each channel independently or stack them together. Handmade and wired for true bypass. This pedal runs off a single 9volt plug (standard 2.1mm center negative).