The J. Rockett Audio Designs .45 Caliber overdrive is a smoking hot "amp-in-a-box" pedal designed to emulate the sound of a cranked JTM45. A simple control layout with two-band EQ, gain and output get you a range of tones that absolutely nail what you hear on an AC/DC record. Take this thing into a vanilla-sounding clean tube amp and send it on a highway to hell in a hurry.