Brown noise on cocoa

How can I create a brown noise generator using Cocoa?

BTW Brown noise is similar to pink and white noise and has nothing to do with "The brown note" or anything silly. See http://www.mediacollege.com/audio/noise/brown-noise.h开发者_如何学JAVAtml

I thought I saw some open source white noise Core Audio audio units around the web but I can't find them. In any case I'd start there since the basics are the same. I think Brown noise is just a few differently set parameters / ranges.

MusicKit might certainly work but Core Audio is part of the OS and likely a lot more CPU-friendly because of that.