Surround : Surround Panning and Mixing : Panning Modes

Panning Modes
For more information, see the following topics:
The Panning Mode button provides access to four panning modes: X/Y mode, Divergence Editing, 3-Knob mode, and AutoGlide mode. Panning controls can be automated in all four modes.
 
Pro Tools provides the following Panning Modes:
X/Y Mode
Joystick-style panning by dragging the Pan Location cursor within the X/Y Speaker Grid. See X/Y Panning for more information.
3-Knob Mode
Point-to-point panning, between pairs of speakers. See 3-Knob Panning for more information.
Divergence Editing
The divergence X/Y Grid can be dragged to resize the divergence boundaries. See Divergence Editing Mode.
AutoGlide Mode
Point-to-point panning from the Pan Location cursor to a new destination over a specified AutoGlide Time. See AutoGlide Mode for more information.
To enable a Panning Mode:
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Click on the Panning Mode button in the Surround Panner until the mode icon is displayed.