So your buddy sent you some audio files in a strange format... Or you downloaded some audio files from a website -- completely legally of course. You certainly didn't get the audio file from the Pirate Bay, because those guys are dangerous. Seriously, the whole fate of the entire free world relies on people not downloading torrents from them. Anyway, you have these audio files and they aren't in the format you want, so what do you do? Download Lona Music Converter for free from the App Store and you are off to the races. The PDF shows the UI and explains who the program works.