The Special Cranker basically acts as an extra preamp tube that you have total control over. It's a great transparent overdrive pedal, but the More knob allows it to push the amp into much dirtier territory. It also has a diode selector that lets you swap between silicon (brighter & tighter) and germanium (warmer & smoother) diodes, so between that and the tone knob, you have a lot of variety. This particular Special Cranker comes in a limited red finish, and it's seen very light usage.