HI, I managed to fix that terrible sound.:bounce3:. Lets see if this applies to anyone else......
My system specis as follows:
Intel Q6600 @ 3.2Ghz
Gigabyte X38-DS5
Saphire 4870x2 -------------->Catalyst 9.7
Creative X-FI XtremeMusic---->Driver ver. 2.18.0013
4 x 2GB OCZ @1066
SSD Intel X25-M 80GB
Gigabyte Odin 1200W
Windows7 x64 Ultimate
Catalyst 9.7 installed HDMI audio driver for my 4870x2. So I dissabled the in DEVICE MANAGER the ATI High Definition Audio Device, started ARMA 2 and boala...... PERFECT SOUND:bounce3:
btw....ArmA 2 version 1.03
Hope this helps.