Audio Controllers

I'm on some audio controllers with a micro display for an web app, still need to adjust some tones, I don't like the pure gray, I'm thinking on adding a very light pass of azure and purple tones to make the metallic more realistic.
Here you go with a live preview. http://jsbin.com/adoxan/2
Still need to setup the initial buttons values.
The main disadvantage are the shadows that, while the elements rotates will not match any more some light source. But hey! at 101 x 101px I'm quite happy with the result!