Step 1: Pick a project
Create a new project and choose Loops from the template selection. This brings up the loops browser and a clear track window to drop them into.
Step 2: Find a theme
GarageBand’s loops browser allows you to view loops by instrument, genre or mood. Click on the search item to choose from hundreds of great loops.
Step 3: Click and preview
Click on the icon next to the loop name to preview it prior to dragging it into the track view. This is useful when you have a lot of loops in your project.
Step 4: Drag it over
Once you’ve found a loop or sample you’re happy with (the longer the better), drag it into the track view. GarageBand will automatically create a new track for it.
Step 5: Up close and personal
Drag the slide on the bottom-left of GarageBand’s window to zoom in towards the end of the loop or sample and find the final note.
Step 6: Cut the loop
Drag the playhead to the point in the loop just before the last note, then choose Split from the Edit menu to separate the two parts ready to create a loop.
Step 7: Copy and paste
Copy the first part of the split loop; this will form the looped section that will play throughout your bed. Paste that back in but don’t overwrite the second part.
Step 8: Repeat the paste
While making sure that the second part of the split loop is clear of where you’re pasting, paste in the first part of your loop repeatedly until your bed is the right length.