Apple Soundtrack - Manual (Page 150)

150 Chapter 9 Working with Automation
When you paste envelope points into an automation row, the new envelope points
replace any existing envelope points, and the automation takes the shape of the cut or
copied envelope in the pasted area.
When pasting envelope points, the following conditions apply:
 Envelope points can only be pasted into an envelope of the same type as the envelope
from which they were cut or copied. For example, envelope points from a volume
envelope can only be pasted into a volume envelope, not a pan or tempo envelope.
 Envelope points for an effect parameter can only be pasted into an envelope for
exactly the same effect parameter in exactly the same type of effect. You cannot
paste envelope points from one effect into another, even if they have parameters
with the same name.
Deleting Envelope Points
After listening to the results of your edits, you may decide to delete some envelope points.
To delete envelope points:
m Select the envelope points, then choose Edit > Delete (or press the Delete key).
When you delete envelope points, the envelope adjusts accordingly, moving evenly
from the preceding envelope point to the next envelope point. If there are no other
envelope points, the envelope becomes horizontal, maintaining its initial value for the
entire project.
Pasting envelope points into
an envelope replaces the
existing area of the envelope
with the cut or copied area.