I actually ran this app in an emulator, and got most of the answer. But it ends in ... instead of }. So not sure where to go from there. Anyone else run through an iPhone emulator and get the whole flag somehow?
Ok, I was stuck on this challenge for a while. Once you know what the numbers are, listen to the file and arrange them based upon what you hear. Then just look at them. Hopefully this doesn't spoil it for anyone.