Thick sustain for creamy leads Hybrid Op-Amp and Germanium Transistor PSI FUZZ IS BORN! “Make a Muffin Better”, Frank Zappa We set out to take a classic design with lots of history and make it obviously something new. We took the op-amp version of old PI and inverted one of the stages, brought out the midrange, tightened the bass, and most importantly, added a Germanium transistor output! Yes, this is a opamp-transistor hybrid. Don’t be miffed by op-amps in your pie folks, the germanium touch at the end makes everyone smile around the shop here. We wanted to celebrate our 12th pedal of the year by offering it in two forms.