Hey, the DS4 problem will be fixed soon.
When it comes to the sound issue - could you tell me what's exactly happening? Is the music disturbed by gunshot SFXs? Where exactly does it occur, any specific fights? Is it reproducible? What are your computer specs?
I'm asking so that I can relay this info to Reikon's sound engineer, maybe he'll be able to help.
Related to sound: the gun effects seem to get swallowed up by other combat sounds and music. Soemthing seems off about the balance of the whole, but most of all the gun sounds could be louder. Not sure this is fixable or even a priority, but I noticed it and it's even come up in reviews and on other forums.