Intro to project properties in GarageBand on Mac

Each GarageBand project has properties that include the project tempo, key and time signature. You can set project properties when you create a project, and change them later while you’re working. Some project properties, such as tempo, should if possible be set when you create the project because they can affect the playback of recordings or media files you add to the project.

You can change project properties in the LCD, located in the centre of the control bar.