Apple Logic Pro 8 - Manual (Page 827)

Chapter 35 Working With Surround 827
Working With Side Chains
When inserting a side chain capable plug-in, the side chain source (selected in the
plug-in header) is routed to all surround instances.
The detection circuits of grouped plug-in instances are linked, and react as one unit.
This ensures that the spatial surround image is not skewed or deformed.
Note: This is also true when no side chain input is selected. In this case, the group’s
combined individual inputs are used to feed the linked detection circuit—effectively
acting like a side chain source.
Working With the Surround Master
When you set the output of a channel to surround, a surround master channel strip is
automatically created in the Mixer. The surround master channel strip processes the
signals routed to the outputs, as configured in the Surround preferences (taking the
project’s surround format into account, of course).
You can insert surround plug-ins into this master channel strip.
Important: As soon as the master channel strip appears, the Insert slots of the
individual output channels are hidden, and any existing effects in the Insert slots (of
output channel strips) are no longer processed. Logic Pro remembers the Insert
configuration, so when you remove all Surround outputs, the original output channel
configuration will be restored.