What is the function of the 'Solo' button in Pro Tools?

The function of the 'Solo' button in Pro Tools is to allow you to hear only the selected track(s) while muting all other tracks. This feature is particularly useful during the mixing process, as it enables the engineer or producer to focus on a specific element of the mix without distraction from the other tracks. By isolating one or more tracks, you can make adjustments and enhancements more effectively, ensuring that each part of your session is heard clearly.

In the context of the other choices, the option that mentions creating a duplicate of the track for easy editing refers to an entirely different functionality that is unrelated to the soloing process. The choice that indicates enabling all tracks to play simultaneously describes the standard operation of a session when no tracks are soloed; this would be the normal mixing workflow rather than the selective listening feature provided by the solo function. Lastly, the option about controlling the volume level of the selected track pertains to the fader controls, which manage the output level of a track rather than isolating it for exclusive listening. Thus, choice A accurately describes the essential purpose and utility of the Solo button in Pro Tools.