Deleting Automation
Automation data takes the form of a line graph with editable breakpoints. The easiest way to remove automation in a track or selection is to manually delete breakpoints from the automation data.
Removing data in this manner is different from using the Cut command, which creates anchor breakpoints at the boundaries of the remaining data. For details, see
“Cutting, Copying, and Pasting Automation” on page 808.
To remove automation data, display the automation parameter you want to edit by selecting it from the Track View selector, or by revealing it in an Automation lane, and do one of the following:
To remove a single breakpoint:

With the Pencil or Grabber tool, Option-click (Mac) or Alt-click (Windows) the breakpoint.
To remove several breakpoints at once:

Use the Selector tool to select a range that contains the breakpoints, and press Delete (Mac) or Backspace (Windows).
To remove all automation data of the displayed type:

Click with the Selector tool in the track and choose
Edit > Select All, then press Delete (Mac) or Backspace (Windows).
To remove all automation for all automation parameters on a track:
1. Use the Selector tool to select a range of data to be removed.
2. Press Control+Delete (Mac) or Start+Backspace (Windows).
All automation data within the selection is removed for all available automation parameters on that track, regardless of whether automation is write-enabled for those controls.