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Both distributions are random, they're just different kinds of random. The one the article refers to as "random" is _uniformly distributed_, while the other is not. Similarly, different _kinds_ of random distributions sound different! Wikipedia has a nice article on various noise distributions with audio samples: http://en.wikipedia.org/wiki/Colors_of_noise


Brown noise sounds lovely, like a waterfall: http://en.wikipedia.org/wiki/Brownian_noise




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