Logic Pro 9 User Manual - Help Library - Apple

To assign a controller to one of the knobs
1 Click the label above the knob.
2 Choose a controller from the menu.
794 Chapter 27 Mixing
Saving and Restoring MIDI Channel Strip Settings
MIDI channel strip settings in the Mixer directly affect the Track Parameter box in the
Arrange window’s inspector. The current settings of all channel strips are saved with the
project.
If the active settings of your sound module are not maintained when you switch it off
(some devices reset to default values), any Logic Pro Mixer settings that affect the unit
will be lost. Fortunately, Logic Pro Mixer settings are automatically restored and transmitted
to all MIDI devices when you reload the project.
On occasion, however, this may not happen, due to MIDI communication issues with
some devices. In this situation, you can manually resend the Logic Pro MIDI channel strip
settings by choosing Options > Send All MIDI Mixer Data.
Using Extended GM: GS and XG Functions in the Mixer
In addition to the General MIDI (GM) standard, GS and XG formats are extended standards
created by Roland and Yamaha respectively.
GS and XG modes allow you to select different effect programs and to control the level
of the reverb and chorus effects.
To display the GS or XG effects
µ Open the Mixer’s View menu and choose Add GS/XG Effects.
The GS/XG configuration control is displayed on the right of the Mixer, allowing you to
select different effect programs.