BSS Audio OPAL Series DPR-944 Owner's Manual - Manual (Page 25)

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9.5 Gain
As compression is a gain reducing process, the output signal level will often
be less than the input. The gain control is provided to restore the output signal
to the desired operating point, and provides a range of +/-20dB relative to the
input signal. The facility for gain loss provided by this control can also be
used, when required, to restore the compressed signal to a point lower than
the input signal and might be useful, for example, when connecting the output
to a high sensitivity input on a following piece of equipment.
9.6 Side chain
listen
Depressing this switch disconnects the main compressor output of the unit
from the normal compressor output and connects it instead to the output of the
parametric filter controlled with the width and frequency controls. This allows
the filter to be configured more easily to select the sounds that are to be
compressed.
As operating the side chain listen control bypasses all compressor functions, in
this mode the DPR 944 is acting as a dedicated high quality parametric
bandpass filter. Although a slightly unusual application, this is a useful
additional feature.
9.7 Frequency
This and the width control endow the DPR 944 compressors with the unique
ability to select a portion of the audio band and compress only that band
(other compressors have the ability to select a given frequency band, but once
activated, compress the whole band).