The Hot Rod Distortion is the world�s most advanced distortion pedal. DigiTech�s exclusive AudioDNA� technology is what makes the Hot Rod much more than the standard distortion stompbox. Rather than working from a single distortion circuit, the Hot Rod features a Morph knob which lets you blend three independent distortion types. This gives you a wider variety of different distortion tones that can be dialed in quickly and easily. 1. Level Knob Controls the effect�s output level. Turn this knob clockwise to increase the output level, and counter-clockwise to decrease output level. 2.Tone Knob Controls the boost or cut of high frequencies. Turn this knob clockwise to increase the high frequency content, and counter-clockwise to decrease the high frequency content. 3. AC Adapter Jack Connect a DigiTech PS200R power supply to this jack. Use the proper supply for your area�s Mains line voltage.