Which of the following will not free up a voice on a track?

• A. Setting the track's input to No Input
• B. Setting a track's voice selector to OFF
• C. Deactivating the track
• D. Removing all of the track's output and send assignments

Answer: (A)

In Pro Tools, a MIDI track uses a limited pool of voices, and a voice is freed when there are no active notes using it. Setting the track’s input to No Input does not immediately release voices that are already in use by notes. It simply stops new notes from being triggered by incoming MIDI, so any currently playing notes will continue to occupy voices until they finish.

Other actions directly affect voice usage: turning the track’s voice selector to OFF stops voice allocation on that track, freeing its voices right away; deactivating the track stops processing altogether and releases its voices. Removing all outputs and send assignments doesn’t directly change voice allocation, since voices are tied to the note activity and the track’s participation in sound generation rather than routing.