Which of the following describes a method to assign source tracks to Aux Input tracks for submixing?

• A. Route the output busses of the source tracks to the AUX input.
• B. Route tracks directly to the master fader.
• C. Shift+Option-click on the track output path to select a new destination.
• D. Create a submix by duplicating tracks.

Answer: (A)

Submixing is about feeding multiple source tracks into a single auxiliary path so you can treat that group as one unit. The way to do this in Pro Tools is to route the output of each source track to the Aux Input track. That Aux Input becomes the submix bus, letting you control all the grouped tracks with one fader and apply processing once on the submix before sending it to the master.

Routing source tracks directly to the master fader would bypass the submix and remove the shared control and processing benefits. Using a keyboard shortcut to change the destination is just a quick way to alter routing, not the specific method for creating a submix. Duplicating tracks creates a copy of the material but doesn’t automatically form a submix; you’d still need to route those tracks to a common Aux or bus to achieve a submix.