How do I configure DAB to 'show' an Audio writing system?

I’ve got a FLEx project that has an Audio writing system in addition to the ‘normal’ writing system for a particular language. I’ve configured the dictionary in FLEx to show the audio writing system and exported it all in LIFT. I’ve told the app which audio files to include. But I’ve not been able to configure the app to present the audio writing system. Is there something I’m missing?

Can I get a look at your LIFT file? Or an entry with the Audio language.
Have you tried a XHTML export?