Sessions & Tracks : Tracks : Assigning MIDI Inputs and Outputs to Tracks : Assigning MIDI Track Output

Assigning MIDI Track Output
Pro Tools lets you assign specific MIDI ports and channels to a MIDI track output. The default selection of none sends MIDI data to no port on any channel. Use the MIDI Output selector to specify a MIDI port and channel for output.
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MIDI tracks in Pro Tools cannot contain multiple channels of MIDI data.
To assign a MIDI track (and all its clips) to a specific MIDI device channel:
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Click the track’s MIDI Output selector and assign a port and channel for MIDI output. Channels already assigned to another track appear in bold.
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In the Edit window, select View > Edit Window > I/O to access any track’s Output selector.
 
To assign multiple destinations to a single MIDI track:
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Control-click (Mac) or Right-click (Mac or Windows) the MIDI Output selector and select additional channels from any device.