Surround : Pro Tools Setup for Surround : Default I/O Selectors in I/O Setup

Default I/O Selectors in I/O Setup
For more information, see the following topics:
The Output page of the I/O Setup dialog provides selectors for setting I/O defaults in your multichannel sessions.
Default Monitor Format
Sets the default monitor format (Stereo, 5.1, or 7.1) for new Output paths and for when you click the Default button.
5.1 Path Order
Selects the default track layout (or, path order) for new 5.1 format (six-channel) Output paths.
Controller Meter Path
Selects the path that will be shown in the control surface output meters. See 5.1 Tracks, Formats, Assignments, and Metering for more information.
Audition Paths
Selects the monitoring path for previewing audio in the Clip List, Import Audio dialogs, and DigiBase. Only outputs on your primary interface can be used as your Audition path.
New Track Default Output
Selects the default output path for all new tracks, for each supported track format.
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The New Track Default Output can be set to bus paths, as well as output paths.
AFL/PFL Path
Selects where tracks are routed to when they are soloed in AFL (After Fader Listen) or PFL (Pre Fader Listen) Solo mode.
AFL/PFL Mutes (Output Path)
Selects which output is muted when AFL (After Fader Listen) or PFL (Pre Fader Listen) Solo mode is enabled, and a track is soloed.