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By default, channels of 2D sounds and music are assigned directly to the corresponding channels of their output bus, regardless of the position or orientation of the listener or game object. You can, however, use the 2D Panner to balance the volume of each channel within the sound or music object so that they can be heard in varying levels through the channels of an output bus.

The 2D Panner contains a two dimensional graph view with X and Y coordinates that simulates the "pan" and "fade" often used in cars where one dial controls the left-right speaker balance and the other the front-back. You can drag the black circle that represents the point source anywhere within this graph view to change the amount of power routed to the channels of the output bus.

So, the Y coordinate has no effect when the output bus is stereo. Note that side speakers of a 7.1 configuration are at their maximum level when the black circle is in the middle.

Interface Element	Description
Name	The name of the object.
Notes	Any additional information about the object properties.
(Graph View)	A graphical representation of the location of the point source in relation to the listener and the speakers in a 4.0 environment. The center channels are defined in the object's Property Editor.
	Zooms in towards the center of the graph view.
	Resets the graph view to the default zoom factor ratio of 1:1.
	Zooms out from the center of the graph view.
X	The coordinate along the X axis of the point source.
Y	The coordinate along the Y axis of the point source. (No impact on a stereo configuration.)