Surround : Multichannel Tracks and Signal Routing : Multichannel Signal Routing : Linking and Unlinking Controls on Multi-Mono Plug-Ins

Linking and Unlinking Controls on Multi-Mono Plug-Ins
When a multi-mono plug-in is used on a multichannel track of more than two channels, the controls are normally linked. Adjusting the Gain control on one channel, for example, will adjust it for all channels.
If necessary, you can unlink plug-in controls on specific channels of a track and edit them independently. You can also selectively link the controls of specific channels.
For example, to apply equal filter cutoffs to the Ls and Rs (surround) channels in a 5.1 mix, you could link enable just those channels in an unlinked, multi-mono EQ plug-in. Adjusting the controls in the plug-in window for either channel (Ls or Rs) adjusts the other, linked channel as well.
Channel Selector
Accesses a specific channel within a multichannel track for plug-in parameter editing. This menu appears only on multi-mono plug-ins inserted on tracks with more than two channels.
Master Link Button
When enabled, links the controls on all channels of a multi-mono plug-in so that they can be adjusted in tandem.
Link Enable Buttons
Let you selectively link the controls of specific channels of a multi-mono plug-in. Each square represents a speaker channel. The Master Link button must be disabled to use the Link Enable buttons.
To unlink controls on a multi-mono plug-in:
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To access controls for a specific channel:
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To open a plug-in window for all channels of a multi-mono plug-in:
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To link the controls of specific channels:
1 Deselect the Master Link button if it is not already deselected.
2 Click the Link Enable buttons for the channels whose controls you want to link.