Psetpre set values of one key in an event before it is passed up

superclass: FilterPattern

Pset(name, value, pattern)

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 Pset

(

var a, b;

a = Psetpre(\freq, 801, Pbind(\dur, 0.5));

x = a.asStream;

9.do({ x.next(Event.new).postln; });

)

Psetpre does not override incoming values:

(

var a, b;

a = Psetpre(\freq, 801, Pbind(\freq, 108));

x = a.asStream;

9.do({ x.next(Event.new).postln; });

)

value can be a pattern or a stream. the resulting stream ends when that incoming stream ends

(

var a, b;

a = Psetpre(\freq, Pseq([401, 801], 2), Pbind(\dur, 0.5));

x = a.asStream;

9.do({ x.next(Event.new).postln; });

)

sound example

(

SynthDef(\sinegrain,

{ arg out=0, freq=440, sustain=0.02;

var env;

env = EnvGen.kr(Env.perc(0.001, sustain), 1, doneAction:2);

Out.ar(out, SinOsc.ar(freq, 0, env * 0.1))

}).add;

)

(

a = Pbind(\dur, 0.5, \instrument, \sinegrain);

a = Psetpre(\freq, Pseq([500, 600, 700], inf), a);

a = Psetpre(\legato, Pseq([0.01, 1],inf), a);

a.play;

)