System Configuration : I/O Setup : I/O Setup Options : Audition Paths

Audition Paths
You can specify the output path through which files and clips are previewed (auditioned) in the Clip List or in DigiBase browsers, and when previewing AudioSuite processing.
The Audition Paths selector is available in the Output and Bus pages of the I/O Setup.
Using the Default Audition Path
When you preview a file or clip in the Clip List in a DigiBase browser, or when AudioSuite processing, Pro Tools routes the audio output through the specified Audition Path. Pro Tools assigns a default Audition Path to the first available main Output path of the corresponding format. You can also select a different Audition Path in the I/O Setup.
Configuring Audition Paths
You can specify the monitoring outputs for auditioning audio in the Clip List and DigiBase browsers, or for previewing AudioSuite processing, using the Audition Paths pop-up menu.
Audition Paths Main Menu
The main menu consists of all path format choices available on the current system (Mono and Stereo on all systems, and LCR and greater on Pro Tools HD or Pro Tools with Complete Production Toolkit only).
Audition Paths Submenus
Each path format choice has a submenu listing Output paths of that given format. (The mono submenu lists Output paths of any format.)
To configure an Audition Path:
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Select a path from the Audition Paths pop-up menu or submenus.