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The 'plug-in microphone' fix was common to other games like Call of Duty as well (http://forums.steampowered.com/forums/showthread.php?t=21964...). From one of the Steam forum entries - "The reason plugging in a microphone works is because 'Stereo Mix' is automatically turned on when you plug in a mic."

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This would probaly not work on some shitty audio cards with shitty drivers that have explicitly removed "stereo mix" for "copyright purposes".

Would it? I'm not entirely sure what the origin of the technology involved is, but as they said, it implicitly enables it even on drivers that don't have it as an explicit option (like the audio driver stack on my Win7 box, at the moment).

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