Mixing : Automation : Trimming Automation

Trimming Automation
For more information, see the following topics:
(Pro Tools HD and Pro Tools with Complete Production Toolkit Only)
If you have already written automation, you can modify automation data for track volume and send levels in real time by using Trim mode. When a track is trim-enabled, you are not recording absolute fader positions, but relative changes in the existing automation. See Trim Mode for more information.
To enable Trim mode:
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In the Mix or Edit window, click the Automation Mode selector of the track where you want to trim automation, and select Trim.
 
When a track’s Trim mode is enabled, its Volume and Send Level faders turn yellow, and its Automation Mode selector is outlined in yellow. This outline appears solid if the track is trim-enabled, and flashes whenever trimming is occurring on the track’s volume or send levels.