There are issues with the audio playback as you say. Adobe has acknowledges that some things got broken during the re-engineering of the preview system. The previous update resolved some of the issues but not all of them. There is another update slated for sometime later this year that (according to Todd) should resolve more bugs with the audio.
So right now if you can't work with how it is in CC2015 I recommend going back to CC2014 and wait for the next update to see if this resolves your issues.
See also this post:
Ya that's what I'm doing for now, thanks
Is there any update to this Adobe??
Audio preview is totally un-usable. I'm on a Top-line MacPro (Trach Can) 64Gb Ram. All updates.
This is REALLY affecting my productivity.