The Cocaine features the same optical compressor circuit as its little two-knob brother, the much beloved COCA COMPRESSOR but offers a lot more controls and tone-shaping features.
The compression is controlled by two knobs. They do pretts much what their labels say:
SUSTAIN adds nothing but clean undistorted sustain to your tone.
SQUASH goes from subtle tone-enhancing to a more pronounced compression effect, but even at full tilt it will preserve the attack of your instrument and keep its character.