ZVEX Effects Fuzz Factory 7 Limited Edition Fuzz Guitar Pedal A limited edition version of our Fuzz Factory Features a 9-position rotary sub switch that opens the pedal up to an astounding new bottom end as well as thin, reedy fuzzes. Increases distortion when used as a normal fuzz, and adjusts feedback pitch and tonal thickness Works equally well with both guitar and bass signals. All ZVex pedals use a 9V DC power supply with () polarity on the middle pin