The Fulltone OCD-Obsessive Compulsive Drive-overdrive pedal packs classic OD tones into a compact pedal with simple, no-fuss operation. From heavy crunch rich with overtones and feedback to spanky cleans, the OCD delivers the sounds of a great tube amp, as sell as the same sensitivity and response to your playing style. Along with standard Volume, Drive, and Tone controls, the OCD's HP/LP (High Peak/Low Peak) switch takes the pedal from a clean boost to manic, sustain-laden distortion. True bypass switching.