The Sir-Compre is an optical compressor pedal with a Friedman twist. The compressor controls include volume, treble, compression, and a tight knob. The twist is the included wide-range gain knob. This gain control is the brain of the Sir-Compre and allows you to shape the overall tone of the pedal from ultra-clean to semi-overdriven. This combination of compression and overdrive offers epic tonal versatility - gritty semi-compression, warm compressed overdrive, singing compressed drive, or adding that special channel to your clean amp - it's all there with the Sir-Compre. And the twist is in the name itself!