System Configuration : I/O Setup : I/O Setup Options : AFL/PFL Path

AFL/PFL Path
(Pro Tools HD and Pro Tools with Complete Production Toolkit only)
Tracks soloed in AFL (After Fader Listen) or PFL (Pre Fader Listen) Solo mode are routed to the current AFL/PFL Path, as set with the AFL/PFL Path selector.
The AFL/PFL Path 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 using AFL or PFL Solo modes.
To select the AFL/PFL Path output:
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Select a path from the AFL/PFL Path pop-up menu.
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Selecting None as the AFL/PFL Path disables AFL and PFL Solo modes. When None is selected, AFL and PFL cannot be used.
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On Pro Tools|HD systems, if you do not see the AFL/PFL Path selector, confirm that you have installed the Surround Mixer in the Plug-Ins (Used) folder. For information on switching Mixer plug‑ins, see the Pro Tools|HD User Guide.
Setting AFL or PFL Path Levels
You can set a separate master AFL/PFL Path level for all AFL solos and all PFL solos.
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Tracks do not need to be soloed to have the master AFL/PFL Path level adjusted.
To set the AFL/PFL Path level for AFL or PFL solos:
1 Choose Options > Solo Mode, and select a Solo mode, as follows:
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– or – 
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2 In the Mix or Edit window, Control-click (Windows) or Command-click (Mac) a Solo button on any track.
3 Adjust the AFL/PFL Path fader.
4 Click on the new fader position (or press Esc) to close the fader display.
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To set the AFL/PFL Path level to 0 dB, Control-Start-click (Windows) or Command-Control-click (Mac) any Solo button.