BBCutProc11

Extension

Description

The original automatic breakbeat cutting algorithm as refined in the BreakBeatx series of classes. This cut procedure favours small odd number length cuts with respect to some subdiv integer for a phrase. A block consists of an original cut plus some number of repeats. A special fast 'stutter' or 'roll' can occur only to finish off a given phrase.

As is normal for cut procedures and synths, the value message is used to get the current value of any input parameter, so functions can be passed. Defaults are provided for all arguments.

For additional data on the algorithm see

Nick Collins, "Algorithmic Composition Methods for BreakBeat Science",

Proceedings of Music Without Walls, ISBN 1857213319

reproduced at http://www.cus.cam.ac.uk/~nc272

Class Methods

.new

Instance Methods

.initBBCutProc11

Examples

You'll have to substitute your own break sample to hear the rhythmic aspects of this procedure properly//must have run this line before any of the examples f= BBCutBuffer(Platform.resourceDir +/+ "sounds/break.aiff",8); //default cutups BBCut2(CutBuf1(f),BBCutProc11.new).play(2.4); ( //demonstrating tempo following from Server Clock control var bbcut, pulse, clock; clock= ServerClock.new.play(100); bbcut= BBCut2(CutBuf1(f),BBCutProc11.new(8,4.0,2,3,0.5,3,1.0)); pulse= SynthDef(\pulse, { var rate, impulse; rate= MouseX.kr(2,3); impulse= Impulse.kr(rate); SendTrig.kr(impulse, 100, rate); Out.ar(0,Decay.kr(impulse,0.1)*SinOsc.ar(440,0,0.5)) }).play; bbcut.play(clock); ) ( //showing use of all parameters var w; var slider,string; var num; var names,data, specs, lastval; var bbcutter, clock; names= ["tempo","cut","phrasebars","stutterchance","stutterspeed","restchance","ampvariation","panvariation","numrepeats","beatsperbar","randomoffset"]; data= //control spec data for ui controls [ [2.0,3.0,\exp, 0.0,2.5], //tempo [4,16,\lin,1,8], //cuts [1,5,\lin,1,2], //phrasebars [0.0,1.0,\lin,0.0,0.2], //stutterchance [1,3,\lin,1,2], //stutterspeed [0.0,1.0,\lin, 0.0,0.0], //restchance [0.0,1.0,\amp, 0.0,1.0], //ampvariation [0.0,1.0,\lin, 0.0,0.0], //panvariation [1,5,\lin,1,2], //numrepeats [2.0,6.0,\lin,1.0, 4.0], //subdivision over x beats [0.0,1.0,\lin,0.0, 0.0] //offsetchance ]; specs= Array.fill(data.size, {arg i; ControlSpec.performList(\new, data.at(i))}); num= names.size; w = SCWindow("BBCutProc11 demo N.M.Collins 23/08/03", Rect.new(100, 500, 500, (30*num))); string= Array.fill(num); slider= Array.fill(num); //Fill with defaults. This array will hold the updated last value of any GUI element lastval= Array.fill(num, {arg i; data.at(i).at(4);}); num.do( { arg i; SCStaticText( w, Rect.new(5, (30*i)+5, 95,20)).string_(names.at(i)); slider.put(i,SCSlider.new( w, Rect.new(105, (30*i)+5, 95,20))); //set slider to default value, else will default to 0.0 slider.at(i).value_(specs.at(i).unmap(data.at(i).at(4))); string.put(i, SCStaticText( w, Rect.new(205, (30*i)+5, 95,20)).string_(data.at(i).at(4))); slider.at(i).action_({arg sl; var val; val = specs.at(i).map(sl.value); string.at(i).string_(val); lastval.put(i, val); //set associated variable to this value, bbcut code will poll this rather than the slider directly }); }); w.front; bbcutter=BBCut2([ CutBuf2(f,{lastval.at(10)}), CutMixer(0,1.0,{ if(lastval.at(5).coin, //restchance {0}, { rrand(lastval.at(6),1.0)} //amp variation )}, {rrand(-1.0*(lastval.at(7)),lastval.at(7))}) //panvariation ], BBCutProc11.new( {lastval.at(1)}, //cut {lastval.at(9)}, //sdbeats {lastval.at(2)}, //phrasebars {lastval.at(8)}, //numrepeats {lastval.at(3)}, //stutterchance {lastval.at(4)} //stutterspeed )); clock=ExternalClock(TempoClock(lastval[0])).play; bbcutter.play(clock); //update tempo ten times a second SystemClock.sched(0.0,{clock.tempoclock.tempo_(lastval.at(0)); 0.1}); ) //If you want fast varying time signatures set phrasebars=1, //and provide interconnected functions updating barlength and sdiv. ( //default eighth note cutups var sf,newbarl,phrasecount; phrasecount=0; BBCut2(CutBuf1(f),BBCutProc11.new( { newbarl=[4.0,3.0,3.5].wrapAt(phrasecount); //4/4 then 3/4 then 7/8 looping phrasecount=phrasecount+1; newbarl*2 //always eighth note cuts }, {newbarl}, 1 )).play(2.4); )