/
ixi_SC_tutorial_09.ps
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ixi_SC_tutorial_09.ps
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do_header
5 466 M
(// =====================================================================) s
5 458 M
(// - SuperCollider Basics -) s
5 450 M
(// =====================================================================) s
5 434 M
(// Tutorial 09 - Granular Synthesis) s
5 418 M
(// =====================================================================) s
5 410 M
(// - ixi audio tutorial - www.ixi-audio.net) s
5 402 M
(// =====================================================================) s
5 378 M
(/* ) s
5 370 M
( ---------------------------------------------------------------) s
5 362 M
( Copyright \(c\) 2005-2008, ixi audio.) s
5 354 M
( This work is licensed under a Creative Commons ) s
5 346 M
( Attribution-NonCommercial-ShareAlike 2.0 England & Wales License.) s
5 338 M
( http://creativecommons.org/licenses/by-nc-sa/2.0/uk/) s
5 330 M
( ---------------------------------------------------------------) s
5 322 M
(*/) s
5 290 M
(// ========== Contents of this tutorial ==========) s
5 274 M
(// 1\) TGrains) s
5 266 M
(// 2\) Warp) s
5 258 M
(// 3\) Custom built grainular synthesis) s
5 250 M
(// 4\) The messaging style) s
5 242 M
(// 5\) Munger) s
5 194 M
(// 1\) ========= TGrains ==========) s
5 178 M
(// TGrains is an SC UGen that performs granular synthesis) s
5 162 M
(b = Buffer.alloc\(s, 44100 * 2.0, 1\); // 2 seconds mono buffer) s
5 146 M
(\() s
5 138 M
(// we load our record and playback synth definitions) s
5 130 M
(SynthDef\(\\recBuf,{ arg out=0, bufnum=0;) s
5 122 M
( var in;) s
5 114 M
( in = AudioIn.ar\(1\);) s
5 106 M
( RecordBuf.ar\(in, bufnum\);) s
5 98 M
(}\).load\(s\);) s
5 82 M
(SynthDef\(\\playBuf,{ arg out = 0, bufnum;) s
5 74 M
( var signal;) s
5 66 M
( signal = PlayBuf.ar\(1, bufnum, BufRateScale.kr\(bufnum\)\);) s
5 58 M
( Out.ar\(out, signal ! 2\)) s
5 50 M
(}\).load\(s\)) s
5 42 M
(\)) s
5 18 M
(// we record into the buffer \(for ca 2 secs\)) s
5 10 M
(x = Synth\(\\recBuf, [\\out, 0, \\bufnum, b.bufnum]\);) s
5 2 M
(x.free;) s
377 474 M
(// test the buffer) s
377 466 M
(x = Synth\(\\playBuf, [\\bufnum, b.bufnum]\)) s
377 442 M
(// let's try TGrains:) s
377 426 M
(\() s
377 418 M
(SynthDef\(\\tgrains,{ arg out=0, buffer=0;) s
377 410 M
( var signal, trate, dur;) s
377 402 M
( trate = MouseY.kr\(1,30\);) s
377 394 M
( dur = 2/trate;) s
377 386 M
( signal = TGrains.ar\(2, Impulse.ar\(trate\), buffer, 1, MouseX.kr\(0,BufDur) s
377 378 M
(.kr\(buffer\)\), dur, 0, 0.8, 2\);) s
377 370 M
( Out.ar\(0, signal\)) s
377 362 M
(}\).load\(s\);) s
377 354 M
(\)) s
377 338 M
(g = Synth\(\\tgrains, [\\buffer, b.bufnum]\)) s
377 330 M
(g.free;) s
377 322 M
(// NOTE: The buffer can contain a wavetable created with .sine1, sine2, cheby, etc.) s
377 314 M
(// \(it doesn't have to be a "sample"\)) s
377 274 M
(// 2\) ========= The Warp ugens ==========) s
377 258 M
(// \(Check the sourcecode for Warp1 \(hit Apple+Y on the name\) and look at the various) s
377 250 M
(// Granular UGens available apart from TGrains\)) s
377 234 M
(// Warp1 - warp a buffer with a warp factor \(stretching/compressing the buffer\)) s
377 218 M
(SynthDef\(\\warp, {arg buffer = 0, pointer =0.3;) s
377 210 M
( var out;) s
377 202 M
( // warp factor of 0.25 - stretch sound by 4 times) s
377 194 M
( // freqScale of 1.5 - pitching the sound up by half octave) s
377 186 M
( out = Warp1.ar\(1, buffer, MouseX.kr\(0,2\), MouseY.kr\(1.5, 0.5\), 0.1, -1, 8, 0.1) s
377 178 M
(5, 1.0\);) s
377 170 M
( Out.ar\(0, out\);) s
377 162 M
(}\).send\(s\);) s
377 146 M
(g = Synth\(\\warp, [\\buffer, b.bufnum]\);) s
377 106 M
(// GrainIn - Grain a live input) s
377 90 M
(b = Buffer.alloc\(s, 44100 * 14.0, 1\); // 14 second mono buffer) s
377 74 M
(SynthDef\(\\grainin, {arg buffer = 0;) s
377 66 M
( var out, pointer, filelength, env, dir;) s
377 58 M
( out = GrainIn.ar\(1, Dust.ar\(20\), 0.1, AudioIn.ar\(1\)*0.4\);) s
377 50 M
( Out.ar\(0, out\);) s
377 42 M
(}\).send\(s\);) s
377 26 M
(g = Synth\(\\grainin, [\\buffer, b.bufnum]\);) s
377 18 M
(g.free;) s
377 2 M
(// or another test:) s
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5 482 M
(\() s
5 474 M
(SynthDef\(\\sagrain, {arg amp=1, grainDur=0.1, grainSpeed=10, panWidth=0.5;) s
5 466 M
( var pan, granulizer;) s
5 458 M
( pan = LFNoise0.kr\(grainSpeed, panWidth\);) s
5 450 M
( granulizer = GrainIn.ar\(2, Impulse.kr\(grainSpeed\), grainDur, Mix.ar\(AudioIn.ar) s
5 442 M
(\([1,2]\)\), pan\);) s
5 434 M
( Out.ar\(0, granulizer * amp\);) s
5 426 M
(}\).send\(s\);) s
5 418 M
(\)) s
5 402 M
(x = Synth\(\\sagrain\)) s
5 386 M
(x.set\(\\grainDur, 0.02\)) s
5 378 M
(x.set\(\\amp, 0.02\)) s
5 370 M
(x.set\(\\amp, 1\)) s
5 354 M
(x.set\(\\grainDur, 0.1\)) s
5 346 M
(x.set\(\\grainSpeed, 5\)) s
5 338 M
(x.set\(\\panWidth, 1\)) s
5 306 M
(// 3\) ========= Custom built granular synthesis ==========) s
5 290 M
(// the source here is a simple sinewave) s
5 282 M
(// and we use a Gaussian curve for the envelope of the grain \(Env.sine\)) s
5 274 M
(\() s
5 266 M
(SynthDef\(\\sineGrain, { arg freq = 800, amp = 0.1, dur = 0.1;) s
5 258 M
( var signal;) s
5 250 M
( signal = FSinOsc.ar\(freq, 0, EnvGen.kr\(Env.sine\(dur, amp\), doneAction: 2\)\);) s
5 242 M
( OffsetOut.ar\(0, signal!2\); ) s
5 234 M
(}\).load\(s\);) s
5 226 M
(\)) s
5 210 M
(Synth\(\\sineGrain, [\\freq, 500, \\dur, 20.reciprocal]\) // 20 ms grain) s
5 194 M
(\() s
5 186 M
(Task\({) s
5 178 M
( 1000.do\({ ) s
5 170 M
( Synth\(\\sineGrain, [ \\freq, rrand\(100, 200\), // ) s
5 162 M
( \\amp, rrand\(0.05,0.2\),) s
5 154 M
( \\dur, rrand\(0.06, 0.2\)) s
5 146 M
( ]\);) s
5 138 M
( 0.01.wait;) s
5 130 M
( }\);) s
5 122 M
(}\).start;) s
5 114 M
(\)) s
5 90 M
(// here the source is a buffer) s
5 74 M
(b = Buffer.read\(s, "sounds/a11wlk01-44_1.aiff"\);) s
5 58 M
(// now play it) s
5 50 M
(\() s
5 42 M
(SynthDef\(\\bufGrain,{ arg out = 0, bufnum, rate=1.0, amp = 0.1, dur = 0.1, startPos=0;) s
5 34 M
( var signal;) s
5 26 M
( signal = PlayBuf.ar\(1, bufnum, rate, startPos\) * EnvGen.kr\(Env.sine\(dur, amp\),) s
5 18 M
( doneAction: 2\);) s
5 10 M
( OffsetOut.ar\(out, signal ! 2\)) s
5 2 M
(}\).load\(s\)) s
377 482 M
(\)) s
377 466 M
(Synth\(\\bufGrain, [\\bufnum, b.bufnum]\)) s
377 442 M
(\() s
377 434 M
(Task\({) s
377 426 M
( 1000.do\({ ) s
377 418 M
( Synth\(\\bufGrain, [ \\bufnum, b.bufnum,) s
377 410 M
( \\rate, rrand\(0.8, 1.2\),) s
377 402 M
( \\amp, rrand\(0.05,0.2\),) s
377 394 M
( \\dur, rrand\(0.06, 0.2\),) s
377 386 M
( \\startPos, rrand\(133,666\)) s
377 378 M
( ]\);) s
377 370 M
( 0.01.wait;) s
377 362 M
( }\);) s
377 354 M
(}\).start;) s
377 346 M
(\)) s
377 330 M
(// another example:) s
377 314 M
(\() s
377 306 M
(SynthDef\(\\grain, {|freq, amp, dur, pan|) s
377 298 M
( var signal;) s
377 290 M
( signal = Pan2.ar\(SinOsc.ar\(freq, 0, amp\) *) s
377 282 M
( EnvGen.ar\() s
377 274 M
( //Env.sine\(dur - 0.001) s
377 266 M
(\), // two different envelopes) s
377 258 M
( Env.perc\(0.001, dur- 0) s
377 250 M
(.001\),) s
377 242 M
( doneAction: 2\),) s
377 234 M
( pan\);) s
377 226 M
( OffsetOut.ar\(0, signal\)) s
377 218 M
( }\).load\(s\)) s
377 210 M
(\) ) s
377 194 M
(\() s
377 186 M
(var time = 0, totalTime = 10, thisGrainDur, message, wait;) s
377 170 M
(fork{) s
377 162 M
( block{| break | ) s
377 154 M
( inf.do{) s
377 146 M
( message = [ \\freq, exprand\(1500, 11000\),) s
377 138 M
( \\amp, rrand\(-18.0, -6.0\).dbamp,) s
377 130 M
( \\dur, thisGrainDur = exprand\(0.02, 0.1\),) s
377 122 M
( \\pan, 1.0.rand2) s
377 114 M
( ];) s
377 106 M
( ) s
377 98 M
( Synth\(\\grain, message\);) s
377 82 M
( wait = thisGrainDur * rrand\(0.05, 0.5\); // divide by some number \(2, 4) s
377 74 M
(, 8\)) s
377 66 M
( time = time + wait;) s
377 58 M
( if \(time > totalTime\) { break.value };) s
377 50 M
( wait.wait) s
377 42 M
( }) s
377 34 M
( };) s
377 26 M
(}) s
377 18 M
(\)) s
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5 474 M
(// 4\) ========= Messaging style ==========) s
5 450 M
(// The Messaging style of sending OSC from the language to the server) s
5 434 M
(// you might have notised that the periodicity of the sound was ) s
5 426 M
(// a bit jittery. This is because we are sending OSC messages from ) s
5 418 M
(// the language to the server in real-time, not taking latency into account.) s
5 402 M
(// This can be better controlled with messaging style rather than the object style) s
5 386 M
(// Here is the object style:) s
5 378 M
(// \(an object you can put into variable and can be messaged\)) s
5 370 M
(x = Synth\(\\sineGrain, [\\freq, 500, \\dur, 0.1]\)) s
5 354 M
(// And the messaging style:) s
5 346 M
(// \(sends an OSC bundle to the server. 0.2 is the scheduled time ahead\)) s
5 338 M
(\() s
5 330 M
(s.sendBundle\(0.2, ["/s_new", \\sineGrain, x = s.nextNodeID, 0, 1], ) s
5 322 M
( ["/n_set", x, \\freq, 400, \\dur, 0.1]) s
5 314 M
( \);) s
5 306 M
(\)) s
5 290 M
(\() s
5 282 M
(var density, graindur, freq, amp;) s
5 274 M
(density = 0.05; // clouds with 50 ms intervals) s
5 266 M
(graindur = 0.1; // the duration of the grain is 100 ms) s
5 258 M
(freq = 300;) s
5 250 M
(amp = 0.2;) s
5 242 M
(Task\({) s
5 234 M
( 1000.do\({ ) s
5 226 M
( // uncomment the object style and comment the messaging style and list) s
5 218 M
(en!) s
5 210 M
( /*) s
5 202 M
( Synth\(\\sineGrain, [ \\freq, freq,) s
5 194 M
( \\amp, amp,) s
5 186 M
( \\dur, graindur) s
5 178 M
( ]\);) s
5 170 M
( */) s
5 162 M
( s.sendBundle\(0.2, ) s
5 154 M
( ["/s_new", \\sineGrain, x = s.nextNodeID, 0, 1], ) s
5 146 M
( ["/n_set", x, \\freq, freq, \\amp, amp, \\dur, graindur]) s
5 138 M
( \);) s
5 130 M
( ) s
5 122 M
( density.wait; ) s
5 114 M
( }\);) s
5 106 M
(}\).start;) s
5 98 M
(\)) s
5 66 M
(// There can be different envelopes in the grains. Here we use a Perc envelope:) s
5 58 M
(\() s
5 50 M
(SynthDef\(\\sineGrainWPercEnv, { arg freq = 800, amp = 0.1, dur = 0.1;) s
5 42 M
( var signal;) s
5 34 M
( signal = FSinOsc.ar\(freq, 0, EnvGen.kr\(Env.perc\(0.01, dur\), doneAction: 2\)*amp) s
5 26 M
(\);) s
5 18 M
( OffsetOut.ar\(0, signal!2\); ) s
5 10 M
(}\).load\(s\);) s
5 2 M
(\)) s
377 474 M
(\() s
377 466 M
(var density, graindur, freq, amp;) s
377 458 M
(density = 0.01; // clouds with 10 ms intervals) s
377 450 M
(graindur = 0.2; // the duration of the grain is 200 ms) s
377 442 M
(freq = 300;) s
377 434 M
(amp = 0.2;) s
377 426 M
(Task\({) s
377 418 M
( 1000.do\({ ) s
377 410 M
( s.sendBundle\(0.2, ) s
377 402 M
( ["/s_new", \\sineGrainWPercEnv, x = s.nextNodeID, 0, 1]) s
377 394 M
(, ) s
377 386 M
( ["/n_set", x, \\freq, freq, \\amp, amp, \\dur, graindur]) s
377 378 M
( \);) s
377 370 M
( ) s