Did anyone ever get this guy an answer? I'm having somewhat the same problem where the sound is great during the playback within APP, but when I export it I get some crackles here and there (in other words poor sound).

Is there a need to render the timeline prior to exporting? I only learned that I could render the timeline (which improves the playback within APP) but have not tried to export after having rendered the timeline yet.

Any thoughts?