If we're going about reinventing the wheel see this excellent post from your forebearers: http://www.earslap.com/instruction/recreating-the-thx-deep-n...

And discussion from a few years ago: http://news.ycombinator.com/item?id=725564

Don't miss their Deep Note SuperCollider one-liner at the end: "play{Mix({|k|k=k+1/2;2/kMix({|i|i=i+1;Blip.ar(iXLine.kr(rand(2e2,4e2),87+LFNoise2.k"