A typical control area or track header for an audio track is shown below:

audio track controls

An audio track has the same controls as a bus, with the addition of two extras.

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Record — The button with the pink circle arms the track for recording. When armed, the entire button will turn pink, and change to bright red as soon as the transport is rolling and the track is recording.
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Playlist — Opens a playlist menu when clicked. The menu offers various operations related to the track's playlist.