What you want might not be supported by your sound card. You'll have to buy a sound card that has that option. My X-Fi Xtrememusic seems to do it pretty well.
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Silent Tuned | 3D Marks 06: 11566
Q6600 2.4ghz CPU | Gigabyte GA-P35 LGA 775 MB
EVGA 8800gt 512mb Video Card
G.Skill 4GB Ram | Western Digital 400GB HD
X-Fi Xtrememusic Sound Card
Antec P180B Case | Scyth Ninja HSF
CM Real Power Pro 650watt PSU
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