87 lines
1.4 KiB
Text
87 lines
1.4 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{Psetpre}
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set values of one key in an event before it is passed up@section{related}
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Classes/Pset, Classes/Psetp
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@section{categories}
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Streams-Patterns-Events>Patterns>Filter
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@section{description}
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Sets a value in an event, before it is passed up the stream. To set the value after it has been passed to the stream, use link::Classes/Pset::.
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@racketblock[
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(
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var a, b;
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a = Psetpre(\freq, 801, Pbind(\dur, 0.5));
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x = a.asStream;
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9.do({ x.next(Event.new).postln; });
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)
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::
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]
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@section{ClassMethods}
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@section{method}
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new
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@section{argument}
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name
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the key
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@section{argument}
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value
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can be a pattern or a stream. The resulting stream ends when that incoming stream ends.
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@section{argument}
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pattern
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the pattern
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@section{Examples}
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@racketblock[
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//Psetpre does not override incoming values:
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(
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var a, b;
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a = Psetpre(\freq, 801, Pbind(\freq, 108));
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x = a.asStream;
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9.do({ x.next(Event.new).postln; });
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)
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(
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var a, b;
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a = Psetpre(\freq, Pseq([401, 801], 2), Pbind(\dur, 0.5));
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x = a.asStream;
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9.do({ x.next(Event.new).postln; });
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)
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//sound example
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(
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SynthDef(\sinegrain,
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{ arg out=0, freq=440, sustain=0.02;
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var env;
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env = EnvGen.kr(Env.perc(0.001, sustain), 1, doneAction: Done.freeSelf);
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Out.ar(out, SinOsc.ar(freq, 0, env * 0.1))
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}).add;
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)
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(
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a = Pbind(\dur, 0.5, \instrument, \sinegrain);
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a = Psetpre(\freq, Pseq([500, 600, 700], inf), a);
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a = Psetpre(\legato, Pseq([0.01, 1],inf), a);
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a.play;
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)
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::
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]
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