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Play an audio region in reverse in GarageBand on Mac
You can play an audio region in reverse using the Reverse Playback checkbox. This can be used for backwards effects, such as reversing a cymbal sound, and creative sound design and mix ideas, such as having a psychedelic backing track for your song.
Play an audio region in reverse
In GarageBand on Mac, select the Reverse Playback checkbox in the Audio Editor inspector.