Yeah, the Line In plug-in at http://www.chronotron.com does this.

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(speaking for myself and doing this in my free time)
See http://zachd.com/pss/pss.html for some helpful WMP info.
This posting is provided "AS IS" with no warranties, and confers no rights.
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"Matt" <Matt@discussions.microsoft.com> wrote in message
news:EAF8F6C1-031B-49AA-A7A8-DA3030AB2194@microsoft.com...
> Is there a way to have windows media player recognize a feed coming in
> through the microphone jack in order to utilize the visualizations? Any
> help
> would be greatly appreciated.