Surround : Pro Tools Setup for Surround : Configuring Pro Tools for Multichannel Sessions : Custom Multichannel Paths

Custom Multichannel Paths
The I/O Setup dialog lets you create and customize signal paths for any supported multichannel mixing format.
Multichannel paths and sub-paths are assigned to input and output channels in the Channel Grid. When you select a preset 5.1 I/O Settings file, default layout for the corresponding multichannel format paths you create will match the selected format’s track layout.
In addition, the I/O Setup dialog, like the Main page of the Hardware Setup dialog, provides controls for routing the physical inputs and outputs on your audio interface to available inputs and outputs in Pro Tools.