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ar bbcutm asig, ibps, isubdiv, ibarlength, iphrasebars, inumrepeats[, istutterspeed, istutterchance, ienvchoice] ar1, ar2 bbcuts asig1, asig2, ibps, isubdiv, ibarlength, iphrasebars, inumrepeats[, istutterspeed, istutterchance, ienvchoice]
The "Breakbeat Cutter" generates cutups of the source audio stream(s) for breakbeat manipulations. Output is rendered as phrases, a sequence of cuts starting at a new bar.
ibps – tempo of the cuts, in beats per second
isubdiv – number of subdivisions in one bar. For example, 8 would represent eight notes in a 4/4 bar.
ibarlength – number of beats in one bar. For example, 4 would represent a 4/4 bar.
iphrasebars – the output cuts are generated in phrases, each phrase is up to iphrasebars long.
inumrepeats – number of repetitions of a cut. Maximum is 1.
istutterspeed (optional) – sets the speed of stuttering. Must be an integer multiple of isubdiv. For example, if isubdiv = 8 and istutterspeed = 2, then the stutter is in sixteenth notes. The default is 1.
istutterchance (optional) – sets the probablity that the end of a phrase will be repeated as a single, one unit stutter. Must be in the range 0 - 1. The default is 0.
ienvchoice (optional) – a value of 1 causes the cut unit to be passed through an exponential gain envelope. A value of 0 turns enveloping off. Turning enveloping off will cause clicking, but may give good results, especially for percussive sources. The default is 1.
asig, asi1, asig2 - source signal to undergo breakbeat manipulation
A typical cut sequence derived from one bar with eighth note subdivisions would be:
3+ 3R + 2
A block of three eight notes is taken from the source's start, then repeated. The cutup ends with a block consisting of the eighth notes seven and eight from the source.
Simple mono and stereo versions:
<CsoundSynthesizer>
<CsInstruments>
sr = 44100
kr = 4410
ksmps = 10
nchnls = 2
instr 1
asource diskin "break7.wav", 1, 0, 1 ; a source breakbeat sample
; wraparound lest it stop!
; cuts in eighth notes per 4/4 bar, up to 4 bar phrases, up to 1
; repeat in total (standard use) rare stuttering at 16 note speed,
; no enveloping
asig bbcutm asource, 2.6937, 8, 4, 4, 1, 2,0.1, 0
outs asig,asig
endin
instr 2 ;stereo version
a1,a2 diskin "break7stereo.wav", 1, 0, 1 ; a source breakbeat sample
; wraparound lest it stop!
; cuts in eighth notes per 4/4 bar, up to 4 bar phrases, up to 1
; repeat in total (standard use) rare stuttering at 16 note speed,
; no enveloping
a3,a4 bbcuts a1, a2, 2.6937, 8, 4, 4, 1, 2, 0.1, 0
outs a3, a4
endin
</CsInstruments>
<CsScore>
i1 0 10
i2 11 10
e
</CsScore>
</CsoundSynthesizer>
Multiple simultaneous synchronised breaks:
<CsoundSynthesizer>
<CsInstruments>
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1
instr 1
ibps = 2.6937
iplaybackspeed = ibps/p5
a1 diskin p4, iplaybackspeed, 0, 1
asig bbcutm a1, 2.6937, p6, 4, 4, p7, 2, 0.1, 1
out asig
endin
</CsInstruments>
<CsScore>
; source bps cut repeats
i1 0 10 "break1.wav" 2.3 8 2 ;2.3 is the source original tempo
i1 0 10 "break2.wav" 2.4 8 3
i1 0 10 "break3.wav" 2.5 16 4
e
</CsScore>
</CsoundSynthesizer>
Cutting up any old audio - much more interesting noises than this should be possible!
<CsoundSynthesizer>
<CsInstruments>
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1
instr 1
a1 oscil 20000, 70, 1
asig bbcutm a1, 2, 32, 1, 1, 2, 4, 0.6, 1
outs asig
endin
</CsInstruments>
<CsScore>
f1 0 256 10 1
i1 0 10
e
</CsScore>
</CsoundSynthesizer>
Constant stuttering, faked. Stuttering is not possible since stuttering can occur only in the last half of the bar.
<CsoundSynthesizer>
<CsInstruments>
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1
instr 1
a1 diskin "break7.wav", 1, 0, 1
;16th note cuts- but cut size 2 over half a beat.
;each half beat will eiather survive intact or be turned into
;the first sixteenth played twice in succession
asig bbcutm asource, 2.6937, 2, 0.5, 1, 2, 2, 1.0, 0
outs asig
endin
</CsInstruments>
<CsScore>
i1 0 30
e
</CsScore>
</CsoundSynthesizer>
Nick Collins
August, 2001
New in Csound 4.16
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