Based on OCD,--Features: Drive, Volume, & Tone Controls: pretty standard fare one most overdrives for letting you dial in the gain, adjust the output volume, and find just the right tonal balance. HP/LP Switch: The High-Peak function gives you increased distortion and low-end, thickening up your sound for a more “British” flavor. The Low-Peak mode gives you a more accurate rendition of your sound with very little coloration of your tone 9-Volt or 18-Volt Power: Use a standard 9-volt adapter or plug in an 18-volt power supply for even more headroom. True Bypass Switching: This comes via Fulltone’s very own custom 3PDT footswitch which they swear is the best in the world.