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I've just started using headphones with HL2, and because the sound turned a bit strange I tried changing the audio stettings from "2 Speakers" to "Headphones". Problem is, when I click on OK and go back to the game my changes seems to revert; the sound is no different and when I check the audi settings again nothing has changed from the original settings - it still says 2 Speakers. I use Vista and have a SigmaTel audio card, which has the latest (albeit old, November 2006) drivers.