The JHS Overdrive Preamp is a faithful re-creation of an unobtainable prototype of a coveted '70s-era overdrive. This guitar effects pedal boasts a simple 2-knob control set consisting of Gain and Level knobs. The Gain knob dials in everything from subtle grit to all-out grind. Level varies between a subtle "always on" sweetening effect and an arena-worthy solo boost. This stompbox also includes a slider switch that alters its clipping arrangement, unlocking a whole alternate set of tones.