I'm not sure (I don't know if there's anyone here on OCN who would know), but the only thing I can think of is the "Recording devices" control panel in Windows. That is, right-click the speaker icon in the Notification Area, choose "Recording devices", and see if this leads you to the answer. I don't know if it will, but it's the only thing I can think of.
Either that, or it could be something you have to do in Audacity first, but I don't know what that would be.
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