Surround : Pro Tools Setup for Surround : Configuring Pro Tools for Multichannel Sessions : Surround Mix Settings Files

Surround Mix Settings Files
The surround mix I/O Settings provide output and bus paths for six specific track layout standards in the new session. (For information on inputs and insert paths, see Default Input and Insert Paths with 5.1 Settings.)
 
DTS Mix (ProControl)
All available 5.1 format (and greater) I/O Settings (Film, SMPTE/ITU, DTS, C24 Mix, Control 24 Mix, or ICON X-MON Mix) provide the following default output and bus paths for the new session:
Default 5.1 Output Paths
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Default 5.1 Bus Paths
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One 5.1 main output bus path, with sub-paths for 5.0 (no LFE), left/right (stereo), LCR, and center (mono).
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Default Input and Insert Paths with 5.1 Settings
The 5.1 Mix settings files provide default stereo main paths and mono sub-paths for inputs and inserts. If you need multichannel input paths or inserts, you can create them in the I/O Setup (see Custom Multichannel Paths).