Child Busses
Child busses allow you to route tracks to particular channels within a surround bus. Creating stereo busses within your surround bus allows you to route stereo tracks directly to a pair of stereo speakers. You can also add child busses with fewer channels than the parent bus in other surround formats.
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Once you have created a surround bus, you can add one or several child busses to it by right-clicking the bus and selecting Add Child Bus.