Hi Punch,
The last guy I suggested this to just yesterday didn't believe me, but the fix could be amazingly easy. Just turn up the sound ingame to full, then use Windows Mixer to adjust the volume to suit you. Seems that lowering the ingame volume control also disables some ingame sounds. Give it a try and let us know. Good luck!
http://forum.1cpublishing.eu/showthread.php?t=29718