Apple Logic Pro 9 - Manual (Page 1160)

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Ls = Left Surround (Rear Left)
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S = Surround (Rear Center)
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Rs = Right Surround (Rear Right)
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LFE = Low Frequency Effects
Configuring Logic Pro for Surround
Before you can create a project in surround, you need to tell Logic Pro which outputs of
your interface are connected to which speaker. If actually recording in surround, you’ll
also need to define what inputs of your audio interface will be used. This is done in the
Output and Input panes of the Audio > I/O Assignment preferences.
Opening the Surround Preferences
There are a number of ways to open the I/O Assignment Preferences in Logic Pro.
To open the I/O Assignment preferences
Do one of the following:
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Choose Logic Pro > Preferences > Audio, then click the I/O Assignments tab (or use the
Open Surround Preferences key command).
1160 Chapter 39 Working with Surround