BSS Audio OPAL Series DPR-422 Owner's Manual - Manual (Page 18)

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6.10 De-ess
The DE-ESS control determines how much gain reduction the BROADBAND
de-esser applies to the signal when a sibilant sound is detected. The maximum
amount of gain reduction available in this mode is approximately 20dB. The
dynamic settings for the broadband de-esser are set automatically by the DPR-
422 and are optimised for general vocal work. The green and yellow LEDs
above the de-ess control provide a simple indication of the degree of de-essing,
with the green LED indicating the start of the operation, and the yellow LED
indicating approximately 15dB of gain reduction. In association with the
FREQUENCY control the broadband de-esser provides a very simple and
effective way of treating general sibilant vocal signals, when processed on their
own.
Control Operations
The FREQUENCY control should be set to coincide with the lowest frequency
in the sibilance sound. To aid the setting of the frequency control, the SIDE
CHAIN LISTEN switch can be depressed and the onset of the lowest sibilant
frequency at the output of the selection filter can then be heard. Note that this
will only be the case if the de-ess HF mode is engaged. If the filter is being
setup for use by the broadband de-esser, temporarily engage de-ess HF mode
to enable SIDE CHAIN LISTEN to pass the filter signal.
6.11 Frequency
6.12 De-ess HF
Depressing this button causes the main compressor to be used as a high quality
high frequency (HF) de-esser. As in broadband de-essing, the compressor is still
only activated when frequencies above the setting of the FREQUENCY control
are encountered. However, once activated, the DPR-422 will only reduce
(compress) those signals that caused the activation. In other words, the DPR-
422 behaves rather like a program dependant high frequency filter. To allow
fine control of the de-essing, the main compressor THRESHOLD, RATIO,
ATTACK, RELEASE and AUTO controls, in addition to the FREQUENCY control