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Use the cycle area in GarageBand on Mac
You can use the cycle area to repeatedly play a particular part of a project. The cycle area can be used for composing, practicing a part before recording, recording multiple takes, and other purposes.

When Cycle mode is on, the cycle area is displayed as a yellow strip in the upper part of the ruler (or in the center, when the secondary ruler is visible). When Cycle mode is turned off, the cycle area is no longer visible.