Specifications

Pro Tools Reference Guide58
With side-chain filters, you can make dynamics
processing more or less sensitive to certain fre-
quencies. For example, you might configure the
side-chain so that certain lower frequencies on a
drum track trigger dynamics processing.
Source
The Source selector lets you set the source for
side chain processing:
Internal, Key, or All-
Linked
.
Internal If Internal is selected, the plug-in uses
the amplitude of the input signal to trigger dy-
namics processing. With greater-than-stereo
multichannel processing, the input signal for
each stereo pair effects only those same chan-
nels, and likewise mono channels are effected
only by their own input signal. For example,
with an LCR multichannel format, the process-
ing for the Center channel is only triggered
when the Center channel input signal reaches
the threshold. However, when the input signal
reaches the threshold on the Left or the Right
channel, processing is triggered for both the Left
and the Right channel.
Key If Key is selected, the plug-in uses the am-
plitude of a separate reference track or external
audio source to trigger dynamics processing.
The reference track used is selected using the
Plug-In Key Input selector in the Plug-In win-
dow header. With greater-than-stereo multi-
channel processing, the key signal triggers dy-
namics processing for all processed audio
channels equally.
All-Linked If All-Linked is selected, dynamics
processing is applied equally to all channels
when the input signal reaches the threshold on
any input channel, except for the LFE channel (if
present). The LFE channel is processed indepen-
dently based on its own input signal.
Detection
The Detection options include Peak or Avg (Av-
erage).
Peak Select the Peak option to apply side-chain
processing according to the detected peak am-
plitude.
Average Select the Average option to apply side-
chain processing according to the detected aver-
age amplitude.
Filter Frequency
The Filter Frequency control lets you set the fre-
quency for the selected
Filter Type.
Filter Type
Four Filter Type options are available for side-
chain processing:
Low Pass Select the Low Pass option to apply a
low pass filter to the side-chain processing at the
selected frequency.
High Pass Select the High Pass option to apply a
high pass filter to the side-chain processing at
the selected frequency.
Selecting the Source setting for Side Chain
processing