Mixing : Automation : Enabling and Suspending Automation : Suspending Automation on All Tracks

Suspending Automation on All Tracks
To suspend automation on all tracks:
1 Choose Window > Automation.
2 Do one of the following:
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To suspend writing of all automation on all tracks, click the Suspend button.
– or – 
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To suspend writing of a specific type of automation on all tracks, click the button for that automation type (volume, mute, pan, plug-in, send level, send mute, or send pan).
 
To suspend Trim automation on all tracks (Pro Tools HD and Pro Tools with Complete Production Toolkit only):
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In the Automation window, Command-click (Mac) or Control-click (Windows) the Suspend button.
The Suspend button highlights yellow to indicate that Trim automation is suspended.