The interaction with the equalizer sliders isn't quite right. Once you grab any slider, you should be able to move the mouse horizontally to affect the rest (draw the curve you want with the mouse).

I learned JavaScript by implementing a similar project which gets this detail correct: http://freecog.net/2005/jsamp/demo/MainWindow.xhtml

(It is quite amusing to read the release notes: "SVG features (the equalizer display) requires Deer Park Alpha 1 or later (Deer Park is the codename for Firefox 1.1, to be released in September).")