This Lovell pedal is based on the 1972 version of the Big Muff, the "Ram's Head". With an added 3-way external switch, we've improved this classic with different mids and bass voicings (original voicing center position), allowing a wider useful range without any sacrifice in its great sound. This pedal also works excellent with bass guitar, and is no doubt a must in any setup. Off course, David Gilmour knew this pretty well.