Apple Logic Pro 9 - Manual (Page 765)

Logic Pro intelligently scans the entire signal path, leaving the aux channel strip open.
This automatic mute suppression applies only to internal send effects. If you are using
external effect units via aux channel strips, the scan will keep effect master sends open.
Logic Pro, however, cannot know which of the channel strips you are using as send effect
returns for external effect units. You must manually switch these channel strips to
solo-safe—preventing them from being muted when you solo another channel strip.
Better yet, make use of the I/O plug-in when you want to use external effects units. This
allows you to use external effects just as you would use internal ones. For more
information, see
Working with External Audio Effects .
To make a channel strip solo-safe
µ
Control-click an inactive Solo button.
A red slash across the Solo button indicates that the channel strip is solo-safe. The channel
strip will not mute when you solo another channel strip.
Control-click again to deactivate the channel strip’s solo-safe state.
Setting Channel Strip Levels
You are probably familiar with setting and adjusting channel strip levels, from creating
your arrangement. You set and adjust channel strip levels, several times during the mixing
process, to control the volume relationships between your project’s parts.
765 Chapter 27 Mixing