Ice Streams

.cc - week eight.

Streams of numbers are commonly used in computer music - this week I have used them make continuos stream of random frequencies and also partials in SuperCollider.


streams.rtf


(

var poly;

poly = Array.newClear(128); //array to hold the synth instances

SynthDef("SoundWallKeys", {

arg freq = 440,
rate = 0.4,
gate = 0.0;

// Variables - declaring
var partials = 20, //number of partials
freqadd = 0,
waveshape,
envStruct,
envGen,
out,
final;

waveshape = {

Mix.fill(
partials, { //each partial's function
SinOsc.ar(
freq: freq + 200.0.rand,
phase: 0,
mul: 1.0 / partials
)
});
};

// Envelope Structure
envStruct = Env(
levels: [0.0,0.99, 0.75, 0.0],
times: [0.1,10.0, 0.1],
curve: 'sine'
); //.plot;

// Envelope Instance
envGen = EnvGen.kr(
envelope: envStruct,
gate: 1.0,
doneAction: 2.0
);

// Output
Out.ar( 0, waveshape * envGen); //add envelope to waveform
Out.ar( 1, waveshape * envGen); //add envelope to waveform


}).send(s);

)

(

var dur, a, b;
dur = 3.7;

a = Routine({ //stream for freq

loop({

750.0.rand.yield;

});

});

b = Routine({ //stream for partials

loop({

25.15.rand.yield;

});

});

Routine({

loop({

Synth( "SoundWallKeys", [ \freq, a.next, \partials, b.next ] );

dur.wait; //make routine wait

});

}).play;

)



.sources.

Haines, Christian 08.05.08, "Streams (1)," Lecture of EMU, Adelaide University.

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