Discontinued optical compressor for live sound and recording. The C-com opti provides adjustable THRESHOLD, RATIO, ATTACK, RELEASE and OUTPUT using a photo-gain cell for a musical dynamic response. An enhancer circuit restores high-frequency content lost during heavy gain reduction. A large analog back-lit VU meter can display either Output Level or Gain Reduction. STEREO LINK INPUT uses a 1/4-inch jack for processing stereo signals and the unit handles +4 dBu and -10 dBV signals.