Mixing : Automation : Thinning Automation : Thin Automation Commands

Thin Automation Commands
The Thin Automation and the Thin All Automation commands lets you selectively thin areas where automation data is too dense. You can use the Undo command to audition the results of thinning (comparing thinning and not thinning) before you apply it permanently.
To manually thin automation:
1 In the Edit window, click the Track View selector to display an automation type you want to thin, or reveal the corresponding Automation lane.
2 With the Selector tool, highlight the automation data you want to thin. To thin automation for the entire track, click in the track with the Selector tool and choose Edit > Select All.
3 Do one of the following:
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To thin only the currently displayed type of automation, choose Edit > Automation > Thin.
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To thin all types of automation, choose Edit > Automation > Thin All.