The Electro-Harmonix BIG MUFF PI is a distortion pedal with three controls: Volume, Tone, and Sustain. It shows signs of use, but has been used only a few times, so there are no issues with sound or operation. I am selling it to change my equipment. Instant purchase is also possible. Please refrain from price negotiations. - Brand: electro-harmonix - Model Name: BIG MUFF PI - Accessories: Instruction manual (English), Box Thank you for viewing. Type... Electric Guitar