http://www.youtube.com/watch?v=Ee-xZLu7EL4
few years ago I wrote a ruff paper on AV , specifically on how to make the connections between A and V more explicit. Anyone interested can download it here
http://dl.dropbox.com/u/5919678/Multitrack%20audio%20visualisers1.0%20by%20Matt%20Black-Coldcut%20copy.doc