Electro-Harmonix DELUXE BASS BIG MUFF PI Distortion/Sustainer PedalThe Deluxe Bass Big Muff Pi from Electro Harmonix is a distortion sustainer pedal which creates large sounding and versatile bass distortion. This pedal features seven knobs. The Volume knob works as a master volume for the entire pedal and is capable of boosting the input signal by 14 dB above unity gain, and obtains the right balance between bypass and effect. The Blend knob mixes between the dry and distorted signals. The Tone knob provides a range