I tried different browsers. Both Chrome and Edge are having the same issue - garbled audio.
I also tried LAN Preview to my IOS9 IPhone 6 Plus - app runs fine, but I have no audio at all.
Really is nearly impossible to guess.
You will get a much better and quicker response (usually) if you include a .capx so we can see how you have everything setup.
One thing to check is make sure you are not playing the sound every tick.