DigiDesign DigiRack Plug-ins Manual page 77

Knee
The Knee control sets the rate at which the com-
pressor reaches full compression once the
threshold has been exceeded.
As you increase this control, it goes from apply-
ing "hard-knee" compression to "soft-knee"
compression:
• With hard-knee compression, compression
begins when the input signal exceeds the
threshold. This can sound abrupt and is ideal
for limiting.
• With soft-knee compression, gentle compres-
sion begins and increases gradually as the in-
put signal approaches the threshold, and
reaches full compression after exceeding the
threshold. This creates smoother compres-
sion.
Hard knee
Graph examples of hard and soft knee compression
For example, a Knee setting of 10 dB would be
the gain range over which the ratio gradually in-
creased to the set ratio amount.
The Gain Reduction meter displays light orange
while gain reduction has not exceeded the knee
setting, and switches to dark orange when gain
reduction reaches the full ratio.
This control ranges from 0 db (hardest response)
to 30 db (softest response).
Gain
The Gain control lets you boost overall output
gain to compensate for heavily compressed or
limited signals.
This control ranges from 0 dB (no gain boost) to
+40 dB (loudest gain boost), with the default
value at 0 dB.
Side-Chain Section
The side-chain is the split-off signal used by the
plug-in's detector to trigger dynamics process-
ing. The Side-Chain section lets you toggle the
side-chain between the internal input signal or
an external key input, and tailor the equaliza-
tion of the side-chain signal so that the trigger-
ing of dynamics processing becomes frequency-
sensitive. See "Using the Side-Chain Input in
Dynamics III" on page 76.
Soft knee
Chapter 6: DigiRack Real-Time TDM and RTAS Plug-ins
For more information on the LFE channel,
refer to the Pro Tools Reference Guide.
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