Apple Logic Pro X - Manual (Page 739)

Chapter 22 Surround in Logic Pro X 739
Do any of the following:
m Move the L or R puck in the surround field to move the second puck in a symmetrical fashion.
m Drag the third puck to move both the L and R pucks, while maintaining a given spread.
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Left/right movement changes the angle of both.
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Up/down movement changes the diversity.
The circular bars around the panner indicate which speakers will carry the respective signal
source; the closer to the center a puck is moved, the wider the corresponding bar gets (the
greater the diversity, in other words).
Use the Surround Balancer on surround input channel strips
If the source input is set to surround, the Surround Panner acts as a Surround Balancer control.
For more information, see
Set the channel strip input format .
Source channels are passed on to their respective output channels without any cross-panning or
mixing. The pan control is represented by a single puck, which affects the multichannel source
signal as a whole.
The separation parameters are not available in this Surround Panner mode.
m Drag the puck to change relative volume balance of the source signal.