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 and pitch picked up by your computer's microphone.
Soundstream looks great as a replacement to the iTunes visualizer, pulsing appropriately to the music.
Also works without a microphone or using the Line In version available on the FAQ page.
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