I've stumbled upon Quasar ( http://www.creativeapplications.net/processing/quasar-processing-sound/)

And was wondering, if anyone had any idea(preferably a tutorial) how to make these lit up spheres. What's causing the biggest issue is the blurriness. I have tried using metaballs and dug up a great example ( http://forum.processing.org/topic/metaballs), however it's waaaaay too slow when running on larger than 640x480 scale.

Any suggestions are welcome