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Rename MIDI regions in the Score Editor in GarageBand on Mac
You can rename the selected region or regions in the Score Editor. If you select multiple regions, they are all renamed to the same name, unless the last character is the number “1”. In that case, the regions are renamed in numeric sequence (1, 2, 3 and so on).
Rename selected MIDI regions in the Score Editor
In the Tracks area of GarageBand on Mac, select the regions you want to correct.
Make sure the Region button is selected in the Score Editor inspector.
In the Region Name field, select the name, then type a new name.