rsc3/doc/examples/ugen/noise/pink-noise.help.scm

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;; (pink-noise rate)
;; Generates noise whose spectrum falls off in power by 3 dB per
;; octave. This gives equal power over the span of each octave. This
;; version gives 8 octaves of pink noise.
(audition (out 0 (mul (pink-noise ar) 0.25)))