System Configuration : I/O Setup : I/O Setup Options : AFL/PFL Mutes (Output Path)

AFL/PFL Mutes (Output Path)
(Systems without a D‑Control or D‑Command Control Surface)
If you are not using a D‑Control or D‑Command worksurface, your regular Pro Tools output path can be muted when you send a signal to the AFL/PFL Path. The muted path is set with the AFL/PFL Mutes (Output Path) selector.
The AFL/PFL Mutes selector is available in the Output and Bus pages of the I/O Setup.
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See Solo Modes for more information on selecting and using AFL or PFL Solo modes.
To set which output path is muted when tracks are soloed in AFL or PFL Solo mode:
1 Choose Setup > I/O.
2 Click the Output tab to display the Output page.
3 Select a path from the AFL/PFL Mutes (Output Path) pop-up menu.
4 Click OK to save your changes to the I/O Setup and close the I/O Setup.