rsc3/doc/examples/ugen/envelopes/free-self.help.scm

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Scheme

;; (free-self src)
;; free enclosing synth when the input signal `src' crosses from
;; non-positive to positive.
(audition
(mrg2 (free-self (mouse-x kr -1 1 0 0.1))
(out 0 (mul (sin-osc ar 440 0) 0.1))))