Any track in Pro Tools can be set to either Tick or Sample based timing. In this video I demonstrate the key differences between the two and when and why you might choose to set tracks to either tick based or sample based.
Usually, MIDI and instrument tracks default to ticks and audio tracks default to samples. Tick based tracks conform to the session tempo, with content on those tracks maintaining a fixed bar and beat position, taking session tempo changes into account. Sample based content maintains a fixed sample position in relation to the session start. In this free video tutorial, I discuss how to use these settings and how to get the most out of them.