LA Audio BCL20 - Manual (Page 7)

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4 4 DESCRIPTION OF CONTROLS DESCRIPTION OF CONTROLS
GAIN REDUCTION DISPLAY GAIN REDUCTION DISPLAY
This 12 Led bargraph indicates the amount of compression (in
dB). The law is expanded at low values.
LEVEL DISPLAY LEVEL DISPLAY
This 12 Led bargraph indicates either the input level or the
output level as selected by the input/output toggle switch.
The bargraph can also be switched between peak and VU
BYPASS BYPASS
This switches the compressor in and out of circuit, so that
comparisons may be made between the compressed and
uncompressed signal.
IN / OUT IN / OUT
This switches the second bargraph display between input and
output level.
DS IN / OUT DS IN / OUT
This button instantly adds de-essing capability to the BCL20 by
adding a filter into the side-chain. This makes the compressor
"frequency conscious", which means that it compresses more on
the frequency chosen, in this case the frequency where
sibilance occurs.
RATIO RATIO
This determines the ratio of compression applied. This may be
varied from 1:1 to LIMIT (20:1). The ratio of compression may
be defined as the ratio which determines how much the output is
allowed to increase by in comparison to an increase of the input.
For example, with a 10:1 compression ratio, once the input
signal is above the threshold level, the output will only rise by
1dB for every 10 dB that the input rises. When the ratio is in
excess of 10:1 the action of such large amounts of compression
is described as "limiting", because the output is unable to
exceed the limit imposed by the compressor.