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The Bass Big Muff PI, from Electro-Harmonix, is a distortion pedal specifically designed to optimize the low-end of bass guitars. It provides front panel controls for Volume, Tone, and Sutain, dual outputs (one for the affected signal and another for the dry signal), and a mini footswitch for activating the bass boost.
The pedal is powered by a 9V battery or AC power supply (sold separately).