Additionally, the controls can be set to distort the sound signal in the pedal, where two Schottky diodes can perform a waveform clipping. ( The germanium diodes are discontinued, we especially select the Schottky diodes to replicate the waveform clipping ) The “gain” knob is a double potentiometer (a “dual-ganged gain pot”), which controls bass and middle frequencies. Treble and volume are each controlled with separate knobs.