Looks like they recently updated the "known issues" to include something regarding the audio;

Sound related issues (Added: Dec. 7 5:15 a.m. PST)

We have been receiving reports of sound related problems and feedback. We are planning to fix the sound driver in the next patch for some bugs that cause sound to be lost under certain setups, such as no audio playback during cutscenes. We will check the factors that cause these problems and address them individually, so we would appreciate your patience. We will also check for feedback such as "it's getting harder to hear" or "the sound doesn't feel right" individually, and if any adjustments are needed, we will fix them in the patch as well.
there's a light at the end of the tunnel \o/