The Thirty-Three TT-1 from Audible Disease is a tribute to the famous Buzz Box. It gives you two octaves down plus ample distortion. This thing can really cough, spit, rip and howl at various settings. A must for any noisehead!! The HVY knob controls the amount of octave. Turning this knob all the way up saturates the processed sound with glitchy deep almost synth-like tones. The BZZ knob controls the amount of distortion. The SW knob lets you dial in a suitable amount of treble. The THR knob controls the volume of the pedal. Operates with either a 9-volt battery or a standard 9-volt DC power adapter with a negative center barrel type tip. We recommend the Visual Sound 1 SPOT power adapter.