Okay, little bug

This app is great. But, I have an iPad mini, I have the latest update, and there is no new update for the app and it isnt working. My cousin has the iPad Retina display mini. Mine is the same but with no Retina display. Im confused. Does it have something to do with the iPad in general? Plz help meh! (PS Im trying to play live loops)

Mronirocks about GarageBand