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Add notes in the Piano Roll Editor in GarageBand on Mac
You can add notes with the pointer in the Piano Roll Editor, to replace a deleted note or to add a note to a chord or region. You can also add notes with your computer keyboard. For more information, see Play software instruments in GarageBand on Mac.
Add a note
In GarageBand on Mac, command-click the place in the Piano Roll Editor where you want to add a note.