Not to be confused with Williams Audio, these pedals are hand-built by Steve Williams in the UK. They are ground-up replicas of the original Maestro FZ-1, most famously used for the guitar sound in the Rolling Stones song "Satisfaction." These are produced in very small quantities (usually 25) and feature original RCA 2N270 transistors and all carbon comp resistors. This Pigdog rendition retains all the positives of the original pedal, without the major drawbacks of noise and inconsistency. Very rare to see one of these here in the States!