Mixing : Basic Mixing : Editing Sends in the Mix and Edit Windows (Individual Send Views) : Linking Send Pan and Main Pan Controls

Linking Send Pan and Main Pan Controls
You can link pan controls of individual Sends to the Main pan controls of their corresponding tracks. This can help you quickly setup cue mix (headphone mix) or effects processing bus routing.
 
Linked Send pan controls appear in light gray.
To link a Send’s Pan controls to the Main Pan controls of a track:
1 Click the Send Assignment button for the Send you want to link to open the Send window.
2 In the Send window, click the FMP (Follow Main Pan) button.
To change the default FMP (Follows Main Pan) setting for newly created Sends:
1 Choose Setup > Preferences and click Mixing.
2 Under Setup, select or deselect the Send Pans Default to Follow Main Pan option.