Hi Bloody Bill.Hey Mikesla, That is pretty much exactly what is going on with mine. Combat sounds very low or not there at all unless right zoomed on a unit then I can hear but low. I also have to have it turned all the way up and there is no background music.
Oh boy, okay well I'm trying to figure it out so if I find a solution I'll definately will let you know. The only thing I can tell you for now is to install your latest Audio drivers that repaired my low level sound problems, but it hasn't fixed my music yet,I have been battling this for a bit now.
Hang tuff for now Bloody Bill.

Cheers...