Hey everybody, I just want to share my experiences with exporting to iOS with Phonegap. 99% the time that it failed, it was because of audio problems.
The problem is in C2 converted .m4a files, they aren't compatible with iOS according to my tests. I hope 
Ashley could check this problem.
The solution that fixed all the builds I made is that I exported the .ogg files and then converted them on an online converter to .m4a. It works instantly.
Also another weird bug that I came accross: if the .m4a file is too small (like under 1kb), you can't hear it on the app.
I hope I helped somebody! Thanks!