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Move the playhead in GarageBand on Mac
The playhead is the vertical line showing the current playback position in the Tracks area and other time-based windows (such as the Audio Editor, Piano Roll Editor, and Score Editor).
The LCD (short for liquid crystal display), located in the center of the control bar, shows the current position of the playhead in one of two formats:
Beats (musical time): Shows measures, beats, and beat divisions.
Time (absolute time): Shows hours, minutes, seconds, and fractions of a second.