Sessions & Tracks : Tracks : Assigning Audio Inputs and Outputs to Tracks : Assigning Audio Inputs

Assigning Audio Inputs
(Audio, Auxiliary Input, and Instrument Tracks)
To assign an audio input of an audio, Auxiliary Input, or Instrument track:
1 In order to assign audio track inputs in the Edit window, select View > Edit Window > I/O.
2 In the Mix or Edit window, click the track’s Input Path selector and choose from the available audio interface channels and busses. Stereo and multichannel surround tracks have inputs available as pairs and multichannel groups.
The Input Path selector lets you route any audio input or any of the Pro Tools internal busses to an audio, Auxiliary Input, or Instrument track. The choices available in this pop-up menu are determined by the Input Path configuration in the I/O Setup. Inputs in use by another track appear bold in the Input Path selector pop-up menu.
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Instrument tracks automatically assign the audio output from the instrument plug-in inserted on the track to the track audio Input.
To automatically assign all track inputs (of the same type and channel width) to unique ascending Input paths (cascading):
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Command-Option-click (Mac) or Control-Alt-click (Windows) the Input Path selector of the left-most Input Path selector and select the first Input Path (mono or stereo, depending on whether your tracks are mono or stereo).
All visible tracks of the same channel width (mono or stereo) are auto-assigned to unique Input Path assignments in ascending order. For example, Track 1 to A1, Track 2 to A2, Track 3 to A3, and so on.
 
To remove an input assignment:
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Select No Input from the Input Path selector.