There are a few iconic valve guitar amps that we at Mozztronics adore. Apart from the British 800 series amps, the AC30, and an American 59 bass amp loved by guitar players, the other is a British amp from the 60s used by The Who guitarist Pete Townshend. This pedal is not a dirt pedal as such, it's our emulation of this classic amp. To do full justice to the original amp, and to get the maximum in tone versatility we included the full 3 knob tone stack in this pedal. A single tone control wasn't going to cut it with this pedal. GAIN controls the amount of gain from the first stage, BASS, MID and TREBLE are the classic 3 knob tone stack as found in the original amp. VOLUME adjusts the overall volume out of the pedal. As with the amplifier this pedal replicates, at lower gain settings, you get the sparkle these amps are known and loved for. Turn the gain up for added rawkus-ness.