Editing : Editing Basics : Nondestructive Editing : Editing during Playback

Editing during Playback
Pro Tools lets you perform many editing tasks while the session plays. This powerful capability lets you interactively modify and edit a session, hearing the changes as you make them.
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Use Loop and Dynamic Transport modes for auditioning and editing loops during playback. See Playback Modes.
Following are just a few examples of editing and arranging tasks that can be performed while playing back a Pro Tools session:
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Adjust or scale automation and MIDI continuous controller data
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There are a few things that cannot be changed while Pro Tools plays, as noted in relevant topics.