Hand built ProCo RAT Distortion, built to original circuit specs. Provides a grit more aggressive than a typical overdrive, but does not turn to mush like a Fuzz Face might. The three-way controls allow the user to sonically tune the unit to fill out any rig. Used by - Jeff Beck, David Gilmour, Nuno Bettencourt, Robert Fripp, Bill Frisell, Dave Grohl.