System Configuration : I/O Setup : Signal Path Routing for Audio Output

Signal Path Routing for Audio Output
The following example shows the signal path from the output of an audio track through an output bus mapped to an output path that is routed to a physical output on an HD I/O audio interface:
 
(1) Track Output
Audio is played back from disk and routed from the Track Output to Output Bus “B 1–2.”
(2) Output Bus Path
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.
(3) Output Path
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.
(4) Physical Output
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).
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For Pro Tools systems such as the Mbox Pro and the 003, physical outputs are fixed. For third-party and built-in hardware, click the Launch Setup App button in the Hardware Setup for available configuration options.