When I set my OpenAL Sound Device to "SB X-Fi Audio [AC00]" I get "WARNING: Setting OpenAL sound device to something other than "Generic Software" may make music stop working."
Sure as shinola, I don't get music. I also don't get hull impacts from weapons, countermessure launch, missile launch, ship explosions, thrust sounds (regular or fly-by) and who knows how many others.
Using OpenAL 1.9.9 and SBXF_PCDRV_LB_2_09_0007.exe drivers package from website.
Have not yet tested whether or not "Generic Hardware" results in the same.
**Edit
"Generic Hardware" results in all audio playing.