Product Description The OKKO Coca Comp is a studio quality compressor and clean boost pedal. It doesn't color your tone, it enhances it.Use it for your clean sound to make it big, tight and punchy without squashing your attack...put it before your dirty amp or overdrive pedals for dynamic singing lead tones without much distortion...plug in your Piezo-equipped acoustic guitar for a fatter, less harsh sound... the Coca makes everything sound better :-) The Coca Comp's circuit has nothing in common with the classic grey, red or orange stompbox compressors.Like expensive studio compressors, it works with an opto coupler for smooth and natural compression.Instead of Attack/Release/Threshold and all the controls, the Coca has only one control for the compression called SING (You won't miss any of the others). It works like an "upward" compressor leaving the attack and strong notes unchanged while amplifying quieter notes and subtleties of your playing and increasing the sustain.PUSH is the volume/boost control, unity gain is around 10 o'clock.The low noise design and parts choice for the Coca Comp results in an exceptionally quiet operation, no hiss, hum or other unwanted noise!