Use automation in the Piano Roll Editor in GarageBand on Mac
You can view region automation, or Smart Control and MIDI controller value changes over time, directly in the Piano Roll Editor. Region automation appears directly below the note being automated.
You can record region automation live using your musical keyboard controller, and you can add and edit automation points in region automation using the same techniques as you use for adding and editing track automation. For information about adding and editing track automation, see Add and edit automation points in GarageBand on Mac.
Show automation in the Piano Roll Editor
In GarageBand on Mac, click the Show/Hide Automation button
in the Piano Roll Editor menu bar (or press A).
An Automation button, an Automation Parameter pop-up menu, and a Cycle Through button appear at the bottom of the Piano Roll Editor inspector. Existing automation is displayed in the Automation Lane under the main editor window. Click the Cycle Through button to cycle through multiple lanes of automation data.