Visualizations For Live Music Options

[Mobias Head]

Hey there,
this is my first post on your board. My question is, I'm looking to run a projection show for my band to add a more multimedia dimension to what we do, and I was wondering how can I run audio from our board into a mac "line in" that is running OSX and have visualizations that react to what we are playing live? I have tried using G-Force. I like the visualizations, but can't seem to get it to work from the line in. Is there some sort of trick, using the open url and putting some sort of "file://in.1" or something along those lines? or is there something that I can buy that is really awesome and is made just for this sort of thing. I was able to get WMP to work alright, but the visualizations kind od suck.
Thanks alot!!
-P