Setting the project surround format, T setting (see, Setting the project surround – Apple Logic Pro 8 User Manual
Page 815: Format

Chapter 35
Working With Surround
815
Setting the Project Surround Format
You can determine the surround format you want to use for a project in the Audio
project settings. By default, a new project is set to 5.1.
To determine the project surround format:
1
Open the Audio project settings by doing one of the following:
 Choose File > Project Settings > Audio (or use the corresponding key command,
default: Option-P)
 Click the Setting Toolbar button, and choose Audio in the pop-up menu.
2
In the Audio project settings, choose the desired format from the Surround Format
menu.
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Tip: Save a project that has been set up for surround format work as a template. This
way you won’t have to set the surround format every time you want to create a new
surround project. Start with the included templates, modify, and save them as your
own templates.