Sorted. Cheers guys, Here's the full run down for anyone else.
From mixer - standard RCA connector to line in on your sound card.
In Windows double click Volume icon. Open 'Properties' and select Recording. Press OK for the changes to be saved by Windows. You can then change the volume if you want.
In Winamp go to Properties and 'Input' select the line in from the list (if nothing here go to to get a line in plugin for winamp - Jasper van der Gronde has made one).
Then click 'add' and select 'add URL'. In the box that appears type in "linein://" (without the quotes), click play and its all go.
Although the visualisation stuff doesnt really feed off the music I play, it works.....