Ok here is how to do it...
Go to the sound volume settings via
START->PROGRAMS->ACCESSORIES->ENTERTAINMENT-> Volume Control
Then change it to show the recording settings.
Make sure you have selected STEREO MIXER and you have the volum up enough 50% will be more than enough.
Now launch winamp and select you favourite VIS and then open a url in winamp and type
linein://
Then launch your jukebox and watch the vis dance along with you tunes. I hid the playlist and winamp it's self what you do with it is up to you...
Have fun.
