Caline CP16 Mr Mark Distortion Guitar Effect Pedal New generic MR Mark Effects. 100% Tested with High Quality This Distortion pedal has 2 gain control. It mean that can make sound from soft distortion to loud distortion sound like MESA BOOGIE MARK IV Amp Gain1 increases treble distortion, adjust the former level of distortion Gain2 controls the amount of bass distortion, adjust the saturation level of distortion LEVEL: Adjust the output level