rsc3/doc/examples/ugen/oscillators/tw-index.help.scm

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;; (tw-index in normalize array)
;; triggered windex. When triggered, returns a random index value
;; based on array as a list of probabilities. By default the list of
;; probabilities should sum to 1.0, when the normalize flag is set to
;; 1, the values get normalized by the ugen (less efficient)
;; Assuming normalized values
(audition
(let* ((prob (mce3 1/5 2/5 2/5))
(freq (mce3 400 500 600))
(f (select (tw-index (impulse kr 6 0) 0.0 prob) freq)))
(out 0 (mul (sin-osc ar f 0) 0.2))))
;; Modulating probability values
(audition
(let* ((t (impulse kr 6 0))
(a (mce3 1/4 1/2 (mul-add (sin-osc kr 0.3 0) 0.5 0.5)))
(f (select (tw-index t 1.0 a) (mce3 400 500 600))))
(out 0 (mul (sin-osc ar f 0) 0.2))))