BSS Audio DPR-404 Owner's Manual - Manual (Page 16)

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8.7 De-ess Threshold control for the high frequency de-esser circuitry. It works
independently of the main compressor section and can be used simultaneously
with it. It uses a second subtractive element that works to reduce only those
high frequencies set by the FREQ control, leaving the other frequency content
of the program unprocessed. De-essing can be equally implemented on both a
full program mix or on an individual track, without fear of introducing audible
side effects.
8.8 FREQ Sets the operating frequency range for the HF de-esser. Control range is from
1kHz to 10kHz allowing precise alignment with sibilant frequencies without
affecting other parts of the program signal.
8.9 Link When depressed, channel one and channel two are linked together to form a
stereo pair. Channel one becomes the master and controls both the threshold,
attack, release, and ratio settings for both channels. The control side chain
signal is also mono summed from both channel inputs to ensure accurate
stereo processing. The de-essing function is linked in a similar manner. When
released, the channel is independent and operated from it’s own controls.
8.10 Link master
LED
When illuminated, indicates that the channel is acting as the master for a
stereo pair, as selected by the link switch.