BSS Audio OPAL Series DPR-422 Owner's Manual - Manual (Page 19)

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are used. The setting of these controls should broadly follow the directions
given in the respective parts of this manual. The below threshold and gain
reduction meters are used to monitor the operation of the HF de-esser. The DE-
ESS control, active and high LED’s play no part in HF DE-ESS mode and are
automatically disabled when the DE-ESS HF mode is activated. Depressing the
SIDE CHAIN LISTEN switch allows the operation of the FREQUENCY control
to be monitored, allowing it to be optimally set to reduce the level of sibilant
frequencies whilst removing as little other program material as possible.
If general compression is required simultaneously with HF de-essing, then
channel 2 of the unit can be used by connecting the two channels in series
with an external cable.
6.13 Side Chain
Listen
If the DPR-422 is in compress mode (de-ess HF switch out), depressing this
switch will switch the output of the unit from the compressor output to the
return signal from the control side chain insertion point. This will allow
monitoring of any external equipment which is connected to the unit to assist
in its setting up. With the de-ess HF switch in, the side chain listen switch
connects the output of the de-esser filter to the output to allow accurate setting
up of the FREQUENCY control by listening to the actual sibilant sounds.
It is recommended that the de-ess HF switch is temporarily depressed to allow
the output of the de-ess filter to be monitored to aid the setting of the
FREQUENCY control for use by the broadband de-esser. Once setup, the de-
ess HF switch can be returned to the desired position.