Surround : Surround Panning and Mixing : Panning Modes : X/Y Panning

X/Y Panning
To pan in X/Y mode:
1 Click on the Panning Mode button until the X/Y mode icon is displayed.
 
2 Drag the Pan Location cursor, or click anywhere in the Grid and drag to pan the track. The location of the Pan Location cursor determines the pan position of the signal. For example, to pan something to the left rear speaker, move the Pan Location cursor to the lower-left corner of the Grid.
 
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It is not necessary to click exactly on the Pan Location cursor. Clicking anywhere in the Grid will move the Pan Location cursor relative to where you click or take over with a hardware panner. Panning does not jump to the click position.
 
To snap the Pan Location cursor to a location in the Grid:
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Control-Shift-click (Windows) or Command-Shift-click (Mac) at the location in the X/Y Grid.
Grid Options and Shortcuts
Fine-Adjust Mode
Hold the Control key (Windows) or Command key (Mac) for fine adjustment of all Panner controls.
Constraining to X or Y Movement
Shift-drag the Pan Location cursor to constrain its movement to the X or Y direction.
Reset to Default
Alt-click (Windows) or Option-click (Mac) in the Panner Grid to reset all controls to their default position.
Snap Pan to Speaker
Click one of the Snap Pan to Speaker icons to force the panner to that speaker location.
Display Automation in Edit Window
Control-Start-click (Windows) or Command-Control-click (Mac) a control to display that control’s playlist in the Edit window.
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All Pan controls can be automated, including pan position and divergence. See Automation for details.