Soundstream is a Mac OS X screensaver created with Quartz Composer.
It consists of a randomly moving particle generator (reminiscent of Flurry) that reacts to the sound level picked up by your computer's microphone.
Soundstream looks great as a replacement to the iTunes visualizer.
For best results, you should adjust either your microphone input level in the Input tab of the Sound preference pane or the Soundstream sensitivity setting.
Operating System Support: Mac OS X 10.4 or later