PrimeLoops teaches you how to use loops on Garageband. There are 2 different types of loops - regular and Apple. The last come in .aiff proprietary file format and the information contained has more information than a regular .wav file. To access them click on the small eye symbol in the lower part of the program window. You can switch to music, podcast and all loops. You also have a Favorites tab and you will see the loops that you mark as a favorite. You can also search for all loops in the search box below.