BSS Audio DPR-404 Owner's Manual - Manual (Page 14)

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8.0 Controls
8.1 IN When depressed the processing is engaged and the green LED lights in
confirmation. When released, processing is disabled, the LED is off and the
incoming signal passes to the output unchanged and at unity gain.
Controls
8.3 Ratio Used to set the scale factor for gain reduction, providing a range of 1:1 to
20:1. Low ratios have soft knee developing into hard limit at 20:1. When set
to ‘out’, no compression will occur even if signal level is exceeding threshold.
Sets the operating level at which compression will occur, adjustable from
+20dBv to -30dBv. Signal level in relation to threshold point is shown on the
gain reduction meter, such that when the TH LED is passed, compression will
commence.
8.2 Gain Output level control used to restore signal after processing, providing ÿ 20dB
of adjustment range. Operation of this control has no affect on threshold
setting and should the output signal level approach +20dBv the adjacent red
LED will illuminate to indicate onset of clip.