I'm using the onboard realtek sound card on my computer and it does work properly in the realtek windows utility, but not in Half-Life 2. The problem there is that sounds come out of all 4 speakers at once instead of the way it should normally work. In the game the audio is set to 4 channel. I did try HL2: Ep2 also, where it seems ok. In that game, sounds in front of me still came out all speakers, but the rear ones were quieter, like the volume levels were set better. Any ideas?