VOsc variable wavetable oscillator


VOsc.ar(table, freq, phase, mul, add)


A wavetable lookup oscillator which can be swept smoothly across wavetables. All the wavetables must be allocated to the same size. Fractional values of table will interpolate between two adjacent tables.


This oscillator requires at least two buffers to be filled with a wavetable format signal.  This preprocesses the Signal into a form which can be used efficiently by the Oscillator.  The buffer size must be a power of 2.


This can be acheived by creating a Buffer object and sending it one of the "b_gen" messages ( sine1, sine2, sine3 ) with the wavetable flag set to true.  


This can also be acheived by creating a Signal object and sending it the 'asWavetable' message, saving it to disk, and having the server load it from there.


If you use Buffer objects to manage buffer numbers, you can use the *allocConsecutive method to allocate a continuous block of buffers. See the Buffer helpfile for details.


table - buffer index. Can be swept continuously among adjacent wavetable buffers of the same size.

freq - frequency in Hertz

phase - phase offset or modulator in radians


note about wavetables:

VOsc requires the b_gen sine1 wavetable flag to be ON.



(

s = Server.local;

// allocate and fill tables 0 to 7

8.do({ arg i;

var n, a;

// allocate table

s.sendMsg(\b_alloc, i, 1024); 

// generate array of harmonic amplitudes

n = (i+1)**2;

a = Array.fill(n, { arg j; ((n-j)/n).squared.round(0.001) });

// fill table

s.performList(\sendMsg, \b_gen, i, \sine1, 7, a);

});

)


(

SynthDef("help-VOsc",{ arg out=0, bufoffset=0;

var x;

// mouse x controls the wavetable position

x = MouseX.kr(0,7);

Out.ar(out,

VOsc.ar(bufoffset+x, [120,121], 0, 0.3)

)

}).play(s,[\out, 0, \bufoffset, 0]);

)


(

8.do({ arg i;

var a;

s.sendMsg(\b_alloc, i, 1024); // allocate table

// generate array of harmonic amplitudes

a = Array.fill(i, 0) ++ [0.5, 1, 0.5];

// fill table

s.performList(\sendMsg, \b_gen, i, \sine1, 7, a);

});

)


(

8.do({ arg i;

var a;

s.sendMsg(\b_alloc, i, 1024); // allocate table

// generate array of harmonic amplitudes

a = Array.fill(32,0);

12.do({ arg i; a.put(32.rand, 1) });

// fill table

s.performList(\sendMsg, \b_gen, i, \sine1, 7, a);

});

)


(

8.do({ arg i;

var a;

s.sendMsg(\b_alloc, i, 1024); // allocate table

// generate array of harmonic amplitudes

n = (i+1)**2;

a = Array.fill(n, { arg j; 1.0.rand2 });

// fill table

s.performList(\sendMsg, \b_gen, i, \sine1, 7, a);

});

)




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