TGrains buffer granulator

Triggers generate grains from a single channel (mono) buffer. Each grain has a Hann envelope (sin^2(x) for x from 0 to pi) and is panned between two channels of multiple outputs.

TGrains.ar(numChannels, trigger, bufnum, rate, centerPos, dur, pan, amp, interp)

numChannels - number of output channels.

trigger - at each trigger, the following arguments are sampled and used 

as the arguments of a new grain. 

A trigger occurs when a signal changes from <= 0 to > 0.

If the trigger is audio rate then the grains will start with sample accuracy.

bufnum - the index of the buffer to use. It must be a one channel (mono) buffer.

rate   -  1.0 is normal, 2.0 is one octave up, 0.5 is one octave down

-1.0 is backwards normal rate ... etc.

Unlike PlayBuf, the rate is multiplied by BufRate, so you needn't do that yourself.

centerPos - the position in the buffer in seconds at which the grain envelope will reach 

maximum amplitude.

dur    -   duration of the grain in seconds.

pan    -   a value from -1 to 1. Determines where to pan the output in the same manner as PanAz.

amp   - amplitude of the grain.

interp - 1,2,or 4. Determines whether the grain uses (1) no interpolation, (2) linear interpolation, 

or (4) cubic interpolation.

(

s = Server.internal;

Server.default = s;

s.boot;

)

s.sendMsg(\b_allocRead, 10, "sounds/a11wlk01.wav");

(

{

var b = 10, trate, dur, rate;

trate = MouseY.kr(2,200,1);

dur = 4 / trate;

rate = Dseq([10, 1, 1, 0.5, 0.5, 0.2, 0.1], inf);

TGrains.ar(2, Impulse.ar(trate), b, rate, MouseX.kr(0,BufDur.kr(b)), dur, Dseq([-1, 1], inf), 0.1, 2);

}.scope(zoom: 4);

)

(

{

var b = 10, trate, dur, clk, pos, pan;

trate = MouseY.kr(8,120,1);

dur = 12 / trate;

clk = Impulse.kr(trate);

pos = MouseX.kr(0,BufDur.kr(b)) + TRand.kr(0, 0.01, clk);

pan = WhiteNoise.kr(0.6);

TGrains.ar(2, clk, b, 1, pos, dur, pan, 0.1);

}.scope(zoom: 4);

)

// 4 channels

(

{

var b = 10, trate, dur, clk, pos, pan;

trate = MouseY.kr(8,120,1);

dur = 12 / trate;

clk = Impulse.kr(trate);

pos = MouseX.kr(0,BufDur.kr(b)) + TRand.kr(0, 0.01, clk);

pan = WhiteNoise.kr(0.6);

TGrains.ar(4, clk, b, 1, pos, dur, pan, 0.1);

}.scope(4, zoom: 4);

)

(

{

var b = 10, trate, dur, clk, pos, pan;

trate = MouseY.kr(8,120,1);

dur = 4 / trate;

clk = Dust.kr(trate);

pos = MouseX.kr(0,BufDur.kr(b)) + TRand.kr(0, 0.01, clk);

pan = WhiteNoise.kr(0.6);

TGrains.ar(2, clk, b, 1, pos, dur, pan, 0.1);

}.scope(zoom: 4);

)

(

{

var b = 10, trate, dur, clk, pos, pan;

trate = LinExp.kr(LFTri.kr(MouseY.kr(0.1,2,1)),-1,1,8,120);

dur = 12 / trate;

clk = Impulse.ar(trate);

pos = MouseX.kr(0,BufDur.kr(b));

pan = WhiteNoise.kr(0.6);

TGrains.ar(2, clk, b, 1, pos, dur, pan, 0.1);

}.scope(zoom: 4);

)

(

{

var b = 10, trate, dur, clk, pos, pan;

trate = 12;

dur = MouseY.kr(0.2,24,1) / trate;

clk = Impulse.kr(trate);

pos = MouseX.kr(0,BufDur.kr(b)) + TRand.kr(0, 0.01, clk);

pan = WhiteNoise.kr(0.6);

TGrains.ar(2, clk, b, 1, pos, dur, pan, 0.1);

}.scope(zoom: 4);

)

(

{

var b = 10, trate, dur, clk, pos, pan;

trate = 100;

dur = 8 / trate;

clk = Impulse.kr(trate);

pos = Integrator.kr(BrownNoise.kr(0.001));

pan = WhiteNoise.kr(0.6);

TGrains.ar(2, clk, b, 1, pos, dur, pan, 0.1);

}.scope(zoom: 4);

)

(

{

var b = 10, trate, dur, clk, pos, pan;

trate = MouseY.kr(1,400,1);

dur = 8 / trate;

clk = Impulse.kr(trate);

pos = MouseX.kr(0,BufDur.kr(b));

pan = WhiteNoise.kr(0.8);

TGrains.ar(2, clk, b, 2 ** WhiteNoise.kr(2), pos, dur, pan, 0.1);

}.scope(zoom: 4);

)

(

{

var b = 10, trate, dur;

trate = MouseY.kr(2,120,1);

dur = 1.2 / trate;

TGrains.ar(2, Impulse.ar(trate), b, (1.2 ** WhiteNoise.kr(3).round(1)), MouseX.kr(0,BufDur.kr(b)), dur, WhiteNoise.kr(0.6), 0.1);

}.scope(zoom: 4);

)

// demand ugens as inputs

(

{

var trate, dur, z, d;

trate = MouseX.kr(1, 100, 1);

d = { Dwhite(0.1, 0.2, 1) };

z = { 

Drand([Dgeom(0.1, 1 + d.value, Diwhite(20, 40)), Dgeom(1, 1 - d.value, Diwhite(20, 40))]) 

};

TGrains.ar(2, 

Impulse.ar(trate),

bufnum: 10, 

rate: Dseq([1, 1, z.value, 0.5, 0.5, 0.2, 0.1, 0.1, 0.1, 0.1], inf) * 2 + 1, 

centerPos: Dseq(z.dup(8), inf),

dur: Dseq([1, d.value, 1, z.value, 0.5, 0.5, 0.1, z.value] * 2, inf) / trate,

pan: Dseq([1, 1, 1, 0.5, 0.2, 0.1, 0, 0, 0], inf) * 2 - 1,

amp: Dseq([1, 0, z.value, 0, 2, 1.0, 1, 0.1, 0.1], inf)

);

}.scope(zoom: 4);

)