Mixing : Automation : Writing Automation to the Start, End, or All of a Track or Selection

Writing Automation to the Start, End, or All of a Track or Selection
For more information, see the following topics:
(Pro Tools HD and Pro Tools with Complete Production Toolkit Only)
Pro Tools lets you write current automation values from any insertion point forward (or backward) to the end (or beginning) of a track or Edit selection in a track, or to an entire track or Edit selection, while performing an automation pass.
 
The standard Write Automation to Start, All, or End commands do not operate when the Pro Tools transport is stopped. It only affects automation for those parameters that are currently write-enabled and currently writing automation data.
Optionally, Write Automation to Start, All, and End can be configured to always be applied automatically. See Writing Automation to the Start, End or All of a Track or Selection on Stop.
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For MIDI automation, the Write To commands only apply to MIDI Volume, MIDI Pan, and MIDI Mute. MIDI parameters cannot use the Write To commands.