API Audio The Channel Strip - Manual (Page 20)

4.5 Side Chain Input
The compressor Side Chain is the detector path that contains the THRUST® filter and RMS detector.
When the compressor type is set to NEW, the Side Chain is fed from a split of the 527 Compressor input
signal. When the NEW type is selected, the Side Chain signal can alternately be fed from an external
signal via the COMPRESSOR SIDE CHAIN IN jack on the rear panel.
COMPRESSOR SIDE CHAIN IN: Input to the 527 Compressor detector path
• Inserting a plug will replace the Side Chain signal
• Only available when the NEW compressor type is selected
• Balanced, low-impedance, +4dBu line level input
• Switching ¼” tip-ring-sleeve jack
19