75 lines
1.7 KiB
Text
75 lines
1.7 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{Pluck}
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A Karplus-Strong UGen@section{categories}
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UGens>Delays
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@section{description}
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A Karplus-Strong UGen
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@section{classmethods}
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@section{method}
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ar
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@section{argument}
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in
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an excitation signal.
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@section{argument}
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trig
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upon a negative to positive transition, emphasis::n:: samples of the excitation signal will be fed into the delay line, where emphasis::n = delaytime * sample_rate / 2::, using a rectangular envelope (no fading).
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@section{argument}
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maxdelaytime
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the max delay time in seconds (initializes the internal delay buffer).
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@section{argument}
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delaytime
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delay time in seconds.
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@section{argument}
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decaytime
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time for the echoes to decay by 60 decibels. Negative times emphasize odd partials.
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@section{argument}
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coef
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the coef of the internal OnePole filter. Values should be between -1 and +1 (larger values will be unstable... so be careful!).
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@section{argument}
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mul
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@section{argument}
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add
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@section{examples}
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@racketblock[
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s.boot;
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// excitation signal is WhiteNoise, triggered twice a second with varying OnePole coef
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(
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{Pluck.ar(WhiteNoise.ar(0.1), Impulse.kr(2), 440.reciprocal, 440.reciprocal, 10,
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coef:MouseX.kr(-0.999, 0.999))
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}.play(s)
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)
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s.quit;
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// a group of angry fretless mandolin players
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(
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{
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var freq, numparts;
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numparts = 50;
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freq = SinOsc.kr(Array.fill(numparts, {Rand(0.05, 0.2)}),
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Array.fill(numparts, {Rand(0, 1.0)})).range(1000, 3000);
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LeakDC.ar(
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Pan2.ar(
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Pluck.ar(
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WhiteNoise.ar(0.1).dup(numparts),
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Impulse.kr(Array.fill(numparts, {Rand(10, 12)})),
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100.reciprocal, freq.reciprocal, 2, Rand(0.01, 0.2), mul: 1),
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Array.fill(numparts, {Rand.new(-1.0, 1.0)}))
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.sum
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);
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}.play(s);
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)
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::
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]
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