Analog VU meters (for those of us who remember them) were a pleasure to watch.
I would like to imitate the fast-attack slow-decay in the audio visualizer. The client wants a single circle that responds to sound. If, for example, the circle is 100 pixels in diameter, a sound like a single drum beat would make the diameter expand to 150 pixels, then slowly return back to 100 pixels -- similar to the motion of the VU meters linked above.
I'm having a hard time creating such an appearance and behavior using the audio visualizer. Any assistance would be greatly appreciated.