Soundcloud (javaScript) custom player create spectrum analyzer

Question

I'm implementing the Soundcloud custom player ( https://github.com/soundcloud/soundcloud-custom-player ) on my site.

I would like to create a spectrum analyzer which moves based on the sound.

I really don't have any idea as to where to start or if it even is possible at all.

Please check out my site to see what I mean: http://dev.upcoming-djs.com

At the right side you see the player and when you click on play it starts playing and the equalizer starts moving.

This is currently a fake effect, but I want it to move with the sound.

All suggestions and/or help is of course much appreciated.