KHDK Ghoul Screamer Overdrive Effects Pedal Drive controls the gain of the circuit. On lower Drive settings, the Ghoul Screamer works as a clean boost with a characteristic mid hump. For more distortion turn the Drive control higher to increase the harmonics, compression and power. Volume controls the overall output volume of the Ghoul Screamer. Tone a very effective active high-frequency tone control. At 12 o'clock it's neutral. Turned clockwise it becomes raw, aggressive and helps your tone cut through. Turned counterclockwise it Conceived in the dark depths of Kirk Hammetts mind, an iconic circuit has been pushed to perfection and equipped with five switches to give you the ultimate control over your tone The KHDK Ghoul Screamer is a multipurpose pedal, a true utility knife of overdrives The dramatic versatility of the controls spans from a clean boost all the way to a massive overdrive In addition to the three standard controls (Drive, Tone, Volume) five mini toggle switches have been added, offering enhancement for Bass, Highs, and Body, as well as two variations of Compression