Check the listing for details. Maxon CP101 Optical Compressor Pedal. Condition: New. Listed at 169.97 USD. Compression for Players Who Hate Compressors Using a compressor in a pedalboard is often viewed as a tradeoff that costs guitarists the nuance, reactivity, and pick attack of their playing, but Sweetwater’s stompbox scholars are in staunch agreement regarding the Maxon CP101 optical compressor: this is the pedal for players who swear compressors have no place on their boards. This may seem like a bold claim, but Maxon’s engineers spared no effort to give guitarists a compression solution that’s impeccably transparent, with an ultra-low noise floor. A hand-selected CdS — cadmium sulfur — photocoupler gives you an optical compression circuit that ditches the noise-inducing transistor design that all-too-often comes with VCA (voltage-controlled amplifier) compressors.