GarageBand for Mac: Tempo track overview
Every project has a tempo, which is expressed in beats per minute (bpm). You can set the tempo in the Project Chooser when you create a project, and change it later while you’re working. You can set the project tempo in the LCD in the control bar. By default, the tempo for new projects is 120 bpm.
You can add and edit tempo changes in the Tempo track. The Tempo track is available in the Tracks area, Audio Editor, Piano Roll Editor, and Score Editor.
In the Tempo track, tempo changes are represented by tempo points. You create tempo changes by adding tempo points and editing their values. You can expand the Tempo track to give yourself more room to work, and adjust the range of values for the Tempo track.
The Tempo track also determines the relationship between incoming timecode and the current playhead position, for projects using timecode.
Show the Tempo track
Choose Track > Show Tempo Track.
Adjust the range of the Tempo track
Do one of the following:
Grab the maximum and minimum values in the tempo scale and drag vertically.
Double-click either value, then enter a numeric value in the field.