To delete several or all envelopes
1.
Select the data that contains the envelopes you want to delete—you can select parts of tracks, one or more whole tracks, or all tracks.
2.
Do one of the following:
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Use the Edit > Delete Special command to open the Delete dialog box.
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Press CTRL+ALT+X or use the Edit > Cut Special command to open the Cut dialog box.
3.
Select Track/Bus Automation if it’s listed.
4.
Select Clip Automation if it’s listed.
5.
Click OK.