GarageBand Control timing with the groove track
You can set a track as a groove track, and match (synchronize) the timing of other tracks in the project to it. When you play the project, the timing of matched tracks adjusts to match the timing of the groove track.
Only one track in a project can be a groove track. You can select which tracks in the project match the timing of the groove track. When a track is set to match the groove track, time quantization is unavailable for that track.
Set the groove track
Control-click a track header, then choose Track Header Components > Show Groove Track from the shortcut menu.
Hold the pointer over the left edge of the header of the track you want to set as the groove track.
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Click the star on the left edge of the track header.
Match other tracks to the groove track
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Select the Match Groove Track checkbox on the left side of each track’s header.
Tracks that aren’t selected won’t match the groove track.
Turn off the groove track
Click the star in the header of the current groove track to deselect it.