A babbling brook by James McCartney 2007.

{ ({RHPF.ar(OnePole.ar(BrownNoise.ar, 0.99), LPF.ar(BrownNoise.ar, 14)
* 400 + 500, 0.03, 0.003)}!2)
+ ({RHPF.ar(OnePole.ar(BrownNoise.ar, 0.99), LPF.ar(BrownNoise.ar, 20)
* 800 + 1000, 0.03, 0.005)}!2) }.play

more to comeā€¦