Apple Logic Pro 8 - Manual (Page 825)

Chapter 35 Working With Surround 825
Working With Multi-Channel Effects
Effects that are not available as true surround effects can be inserted as multi-channel
effects on surround channels: Logic Pro matches the surround format of a channel by
automatically providing the required number of stereo and mono instances of the
plug-in.
Learning About the Advanced Plug-in Header
Multi-channel effect plug-ins offer an advanced plug-in header.
It can include a tab for each effect instance, an LFE tab, and a Configuration tab. The
effect tab labels indicate if effect instances are loaded in stereo or mono. Channels
joined with a “–” are loaded as a stereo instance. Channels separated with a “ | ” are
mono. To explain:
 L-R|Ls-Rs|C denotes left/right stereo, left/right surround stereo, and mono center.
 L-R|Rs|C (a separate left surround tab is shown) denotes left/right stereo, mono right
surround, mono center.
 L-R, C, and Ls-Rs shown on three separate tabs denotes left/right stereo, center
mono, left/right surround in stereo.
Each effect tab is, in essence, a discrete effect unit for each channel (or channel pair). As
such, you can have different plug-in parameters for the L-R tab, the C tab, the Ls-Rs tab,
and the LFE tab. When you save plug-in settings, the parameter values of each tab are
saved.
You can assign these different mono or stereo configurations in the Configuration tab.