Um Side Chain: Side Chain / External Key The C Com 16 features a side-chain or external Key function. The external Key function is used to externally process the compressor’s detector circuit. There are many useful applications for processing the detector circuit including Equalizing for frequency dependent compression, De-Essing - the use of EQ to remove sibilance, and externally keying off a vocal track for Ducking effects, to name a few. The Key insert jack sends the compressors trigger...