Audio is played back from disk and routed from the Track Output to Output Bus “B 1–2.”
The Output Bus is defined on the Bus page of the I/O Setup. On the Bus page of the I/O Setup, the Output Bus “B 1–2” is mapped to Output “B 1–2,” which is defined on the Output page of the I/O Setup.
On the Output page of the I/O Setup, the Grid is used to route the output path (to which the output bus is mapped) to physical outputs.
For Avid HD audio interfaces, such as the HD OMNI, the physical outputs that are available to Pro Tools are set on the Main page of the Hardware Setup (this selector is mirrored in the Output page of the I/O Setup).