Powered by KHDK's original circuit, the No.1 is designed in the spirit of an overdriven tube amp. Turn the No.1 on and you'll feel like you've switched to a powerful distortion channel on a tube amp. The No.1's unique feature is its double gain control One just wasn't enough! That's why we built No.1 with two gain controls. Gain one controls the first gain stage from a pure clean boost to a naturally compressing overdrive. Gain two shares one knob with the Bass control. It cleverly controls the gain and the low-end of the next gain stage, which adds rich harmonics, bottom end, and natural tube-like saturation to your tone. It's designed as an active high-pass filter for the second gain stage and allows you to set the amount of bottom-end with precision. The result is rich, harmonic overdrive.