After you create automation points and curves, you can easily change things to meet your needs. You can copy automation within a track or between tracks and can move automation within a track. When moving a region, you can choose whether or not to move any existing automation with it. When deleting automation, you can delete individual or multiple automation points.
In GarageBand on Mac, do one of the following:
To select an automation point: Click it.
To add automation points to, or remove them from, the selection: Shift-click the points you want to add or remove.
To select a range of consecutive automation points: Drag in the background of the automation track.
In GarageBand on Mac, select the points or curves you want to copy, then Option-drag the selection to a different location on the track.
Any existing points in the target location are deleted.
In GarageBand on Mac, hold down Shift while dragging a selection within the automation area.
Choose Edit > Copy (or press Command-C).
Select the track you want to copy the automation to.
Move the playhead to the point in the ruler where you want to paste the automation you copied.
Choose Edit > Paste (or press Command-V).
In GarageBand on Mac, choose Mix > Move Automation with Regions.
Now, when you move or copy a region, the automation points stay with it.
In GarageBand on Mac, do one of the following:
Double-click the automation point.
Select the automation point, then press Delete.
In GarageBand on Mac, do one of the following:
Select multiple automation points, then press Delete.
Important: Make sure that no regions are selected, or they will also be deleted.
Choose Mix > Delete All Automation on Selected Track.