Apple Logic Pro 8 - Manual (Page 824)

824 Chapter 35 Working With Surround
To insert plug-ins that do not match the channel format:
m Option-click a channel Insert slot.
The Plug-in menu will display all formats the plug-in has to offer, rather than being
limited to the matching format.
Any down or up mixing that may be necessary will happen automatically.
 The default format of software instruments is stereo (if available). Mono and the
project surround format are offered as additional formats.
 The default format of effect plug-ins is the current channel format (at the insert point
in the signal path).
 In addition, all plug-in format variations (based on the current channel input format,
and all available plug-in output formats) are offered—up to the maximum allowed
by the project surround format.
 Logic Pro effect plug-ins can also be operated in a multi-mono configuration, based
on the project surround format.
Note: Logic Pro automatically performs surround down and upmixes whenever the
format of the input and output channels don’t match. As an example, if you insert a
quad plug-in into a 5.1 bus, Logic Pro will perform a downmix from 5.1 to Quad,
followed by an upmix back to 5.1.
Down Mixer Plug-in
You can use the Down Mixer plug-in to adjust the input format of the surround master
channel strip. This allows you to quickly check the surround mix in stereo, for example.
Channel mapping, panning, and mixing is handled behind the scenes. You do, however,
have some control over the mix:
 Destination Format: Choose the desired surround format from the menu, which
includes: To Stereo, To Quad, To LCRS.
 Generic level sliders: These sliders control the respective channel levels. The number,
and names, of sliders is dependent on the chosen plug-in format.