Specifications

Digidesign Plug-Ins Guide16
If necessary, you can unlink plug-in controls on
specific channels of a track and edit them inde-
pendently. You can also selectively link the con-
trols of specific channels.
To unlink controls on a multi-mono plug-in:
■ Deselect the Master Link button.
To access controls for a specific channel:
■ Select the desired channel from the Channel
Selector.
To link the controls of specific channels:
1 Deselect the Master Link button if it is not al-
ready deselected.
2 Click the Link Enable buttons for the chan-
nels whose controls you want to link.
Using a Key Input for Side-
Chain Processing
Some plug-ins, such as the DigiRack Compres-
sor, Limiter, Gate, and Expander/Gate, feature
side-chain processing capabilities. Side-chain
processing allows you to trigger a plug-in from a
separate reference track or external audio
source. The source used for triggering is referred
to as the Key Input. Key inputs are monophonic.
A typical use for this feature is to control the dy-
namics of one audio signal using the dynamics
of another signal (the Key Input). A kick drum
track, for example, can be used to trigger gating
of a bass track to tighten it up. A rhythm guitar
track can be used to gate a keyboard pad, and so
on.
Key Input Filters
Some plug-ins feature key high pass and low
pass filters. These controls allow you to define a
specific frequency range in the Key Input signal
with which to trigger the plug-in effect. A com-
mon production technique is to use these con-
trols to filter a drum track so that only specific
high frequencies (a hi-hat, for example) or low
frequencies (a tom or a kick, for example) trigger
the effect.
Channel Selector and Link controls
Link Enable buttons
Master Link button
Channel Selector
RTAS plug-ins do not provide side-chain
processing when used on TDM-based sys-
tems; consequently, use the TDM versions
of plug-ins on TDM-based systems if you
want to use side-chain processing.
Choosing a Key Input