Hackers in Residence: The Sound Visualizer Pt. 2
Contributors:
onebeartoe
onebeartoe 
Resources and Going Further
Source Code
The original source code for the equalizer was made available by Jasper Pots. I added PIXEL/IOIO code to visualize the music on an LED panel, as well. The source code for this project is available at this GitHub repo.
Changing Colors
The color for the sound visualizer is hardcoded to SparkFun red. This hard coded color is defined in the Pixel#drawEqualizer() method, but it could be made configurable at runtime.
See the ‘Modify the Java App’ section of the Sound Visualizer tutorial, for more details on how to make modifications with Netbeans and re-build the app to see code changes.