38 lines
1.1 KiB
Text
38 lines
1.1 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{(linen gate attackTime susLevel releaseTime doneAction)}
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A linear envelope generator. The done flag is set when the
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envelope reaches zero.
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Note that the sustain level input is consulted only at the instant
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when the gate is opened.
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(let ((e (linen (impulse kr 2 0) 0.01 0.1 0.4 do-nothing)))
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(audition (out 0 (mul (sin-osc ar 440 0) e))))
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(let* ((y (mouse-y kr 0.1 0.5 0 0.1))
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(x (mouse-x kr -1 1 0 0.1))
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(e (linen x 1 y 1.0 do-nothing))
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(o (sin-osc ar 440 0)))
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(audition (out 0 (mul o e))))
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Open gate for a random interval.
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(let* ((r (rand 0.05 0.4))
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(u (letc ((gate 0))
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(let ((e (linen gate 0.1 0.2 0.1 do-nothing)))
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(out 0 (mul (sin-osc ar 440 0) e)))))
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(g (encode-graphdef (synthdef "linen" u))))
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(with-sc3
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(lambda (fd)
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(async fd (d-recv g))
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(send fd (s-new0 "linen" 1001 1 1))
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(send fd (bundle (utc) (n-set1 1001 "gate" 1)))
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(send fd (bundle (+ (utc) r)
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(n-set1 1001 "gate" 0)))
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(sleep (* r 4))
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(send fd (n-free1 1001)))))
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