Only the Apple Loops will work in GarageBand on your iPad/iPhone. You would need to download the loops to your computer and transfer them to your iPad/iPhone. Then they should show up in the loop tab of Garageband. Hold your finger on the loop and then drag it into your track. That's it! On the go uke and implement production!
The sample libraries will not work.
The Apple Loops should work in any iOS program that plays apple loops.
A sample library is a collection of sound files that load into a sampler like Logicʻs sampler or NI Kontakt. Samples are recordings of each individual note that an instrument plays. When they are loaded into a sampler, they can be played like a piano, but the sound will be that of the instrument that was recorded. Wikipedia explains it here
Loops are short 1, 2, 4,... bar performances of an instrument that when played will keep repeating. Drum and percussion loops are an easy way to build a rhythm track for your song.
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