I’ve added this tip to the iBooks guide. That’s an odd workaround, but glad it does the trick for you. Was audio just not playing at all without this?
I had 3 quick questions about your workaround if you don’t mind:
Did you figure out this IBA audio workaround in the pre-publishing stage or after it was actually published?
Have you verified this workaround as working for published iBooks on all platforms (mac, iPad and iPhone)?
What audio file types did you use (the ones that you removed the file extensions from)?
Thanks so much!