Play Apple Loops
After searching for loops in the Loop Browser, you can listen to the results to find the loop that sounds best in your project. When you listen to a loop, you can hear it by itself (solo), or play it together with the project.
Play a loop
Select a loop in the results list.
The loop plays back in the project’s tempo and key.
Drag the Volume slider at the bottom of the Loop Browser to adjust the volume of the loop you’re listening to.
Choose a key from the “Play in” pop-up menu to adjust the playback key.
The loop plays to the project key by default, but you can play the loop in its original key or any key from C to B.
Click the loop again to stop playing.