How do I choose local notification sound on iOS?

Hi!

My local notifications are working great, but I cant seem to change the notification sound?!? It always plays the “trippel tone” even if I try to change it to “beep.caf” and other native iOS-sounds. I have also tried to change all the sounds in my iPod´s settings with no luck.

Maybe it´s not possible without creating my own .caf sound?