You will be unable to set Stereo Mix as the default audio device after enabling it for the first time

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Source: Microsoft Support
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Action
After installing a new sound card, you enable Stereo Mix in the Sound properties dialog box from the Control Panel.
Result
You will be unable to set Stereo Mix as the default audio device.
Cause
This is a known issue in Microsoft Windows Vista.
Resolution
To resolve this issue, close the Sound Properties dialog box, and then reopen it.  You will now be able to set Stereo Mix as the default audio device.
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Article ID: 967678 - Last Review: 01/16/2015 18:06:52 - Revision: 2.0

Windows Vista Business, Windows Vista Business 64-bit Edition, Windows Vista Enterprise, Windows Vista Home Basic, Windows Vista Home Premium, Windows Vista Ultimate, Windows Vista Starter, Windows Vista Service Pack 2, Windows Vista Service Pack 1

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