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From JHS's "Legends of Fuzz" series, the Crimson is a replica of Mike Matthews 1992 Red Army Overdrive. The original Red Army Overdrive is technically the 7th version of the Big Muff, but has a warmer, clearer, and more defined sound than other Soviet Big Muffs. The Crimson is an exact replica of the this rare and unique pedal.
The controls are Volume, Tone, and Distort. Volume sets the overall output level of the effect; turn it up and things get louder. Tone lets you sweep between bright and dark tones so that the Crimson works well with a range of different amplifiers and guitars. Distort is the distortion control; the more you turn it clockwise, the more fuzz you create. On the side you will see a “Mode” button that lets you access a never before heard “JHS Mode”. Push that button for a mid frequency boost that forces your sound through the mix.