On Thu, Oct 8, 2009 at 8:58 AM, Atte Andre Jensen <atte.jensen@gmail.com> wrote:

Hi

I know I'm a bit slow, but I just found that it's quite simple to totally encapsulate an instrument in a function, ugens and all, as the example below shows. Now I'm wondering how much overhead this yields compared to keeping the ugens, ADSR.set and stuff like that outside the function?

I guess part of the answer is it depends on what one needs to do. Do you need to play the instrument monophonically, with a small, fixed number of voices or ad-hoc polyphony. The instrument-in-a-function solution elegantly solves the polyphony problem, I can just spork as many voices as I need, and they are automatically destroyed when finished. But how great a peak in cpu usage does the creation of the ugens generate?

5 => int octave;
.1 => float gain;
[0,2,4,7,9,11,14,16] @=> int notes[];

while(true){
notes[Std.rand2(0,notes.cap()-1)] + 12*octave => int note;
ms * Std.rand2f(1500,2000) => dur length;
spork ~ ep(note, length, gain);
ms * Std.rand2f(150,1500) => now;
}

fun void ep(int note, dur length, float gain){
2::second => dur decay;
10::ms => dur release;
SinOsc s1 => ADSR e1 => dac;
SinOsc s2 => ADSR e2 => dac;
gain => s1.gain;
gain * .2 => s2.gain;
e1.set(1::ms, decay, 0, release);
e2.set(1::ms, decay * .3, 0, release);
Std.mtof(note) => s1.freq;
s1.freq() * 2=> s2.freq;
e1.keyOn();
e2.keyOn();
if(length < decay){
length => now;
e1.keyOff();
e2.keyOff();
release => now;
} else {
decay => now;
}
}

--
Atte

http://atte.dk http://modlys.dk http://virb.com/atte
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