Basic Mixing : Signal Flow by Track Type
 
Signal Flow by Track Type
Pro Tools provides the following track types:
Audio
Auxiliary Input
Master Fader
MIDI
Instrument
Audio, Auxiliary Input, Master Fader, and Instrument tracks can route audio. MIDI and Instrument tracks can route MIDI data.
Tracks can be identified in the Mix window by their Track Type icon.
Audio, Auxiliary Input, Master Fader, MIDI, and Instrument tracks
*For information on creating tracks, see “Creating Tracks” on page 83.