Setting up multiple tempos in GarageBand is a straightforward process.
Use the keyboard shortcut (Shift + Command + T) to access the tempo track, and then you can set several automation points on the grid-line to adjust the tempo at different points of the track.
How to Set Up Multiple Tempos in GarageBand (Step-By-Step)
1) Use (Shift + Command + T) to Bring Up the Tempo Track

The result is the same though.
2) Add Automation Points by Clicking the Blue Line

The one difference between the automation of the tempo track and regular automation is that you won’t need to drop an additional 2 points.
For regular automation, it often makes sense to use 4, at least if you wanted to decrease the volume, for example, for a moment.
For tempo automation, it’s best to use two points.
3) Drag the Line Up for Tempo Increase (Down for Decrease)

5 Tips for Setting Up the Tempo Track in GarageBand
1) Click the Little Ball to Create a Tempo Curve

This will allow you to curve or make the tempo adjustments more gradual. Keep in mind there is somewhat of a learning curve to using the tempo track in this way. Be patient.
2) Zoom In with the Slider to Get More Precise

This will allow you to get much closer to your tracks for more precision. If you don’t zoom in, visibility and clarity will be an issue.
3) Click the Grey Interface to Leave the Automation Line

To avoid unintended adjustments, click away from the tempo track to reset your selection.
This will allow you to reset which points you’re trying to adjust. I chose the grey interface, but you can click away in another area.
4) There’s Also A Tempo Track in the Smart Controls

5) You Can Use Track > Show Tempo Track As Well

Do you have any comments, questions, or concerns? You can let me know in the comments section below.
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