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<div class="refentry" title="bbcutm">
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<h2>
<span class="refentrytitle">bbcutm</span>
</h2>
<p>bbcutm —
Generates breakbeat-style cut-ups of a mono audio stream.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp14413848"></a>
<h2>Description</h2>
<p>
The BreakBeat Cutter automatically generates cut-ups of a source audio stream in the style of drum and bass/jungle breakbeat manipulations. There are two versions, for mono (<span class="emphasis"><em>bbcutm</em></span>) or stereo (<span class="emphasis"><em>bbcuts</em></span>) sources. Whilst originally based on breakbeat cutting, the opcode can be applied to any type of source audio.
</p>
<p>
The prototypical cut sequence favoured over one bar with eighth note subdivisions would be
</p>
<div class="literallayout">
<p><br />
3+ 3R + 2<br />
</p>
</div>
<p>
where we take a 3 unit block from the source's start, repeat it, then 2 units from the 7th and 8th eighth notes of the source.
</p>
<p>
We talk of rendering phrases (a sequence of cuts before reaching a new phrase at the beginning of a bar) and units (as subdivision th notes).
</p>
<p>
The opcode comes most alive when multiple synchronised versions are used simultaneously.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp14426088"></a>
<h2>Syntax</h2>
<pre class="synopsis">a1 <span class="command"><strong>bbcutm</strong></span> asource, ibps, isubdiv, ibarlength, iphrasebars, inumrepeats \
[, istutterspeed] [, istutterchance] [, ienvchoice ]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp14427296"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ibps</em></span> -- Tempo to cut at, in beats per second.
</p>
<p>
<span class="emphasis"><em>isubdiv</em></span> -- Subdivisions unit, for a bar. So 8 is eighth notes (of a 4/4 bar).
</p>
<p>
<span class="emphasis"><em>ibarlength</em></span> -- How many beats per bar. Set to 4 for default 4/4 bar behaviour.
</p>
<p>
<span class="emphasis"><em>iphrasebars</em></span> -- The output cuts are generated in phrases, each phrase is up to iphrasebars long
</p>
<p>
<span class="emphasis"><em>inumrepeats</em></span> -- In normal use the algorithm would allow up to one additional repeat of a given cut at a time. This parameter allows that to be changed. Value 1 is normal- up to one extra repeat. 0 would avoid repeating, and you would always get back the original source except for enveloping and stuttering.
</p>
<p>
<span class="emphasis"><em>istutterspeed</em></span> -- (optional, default=1) The stutter can be an integer multiple of the subdivision speed. For instance, if subdiv is 8 (quavers) and stutterspeed is 2, then the stutter is in semiquavers (sixteenth notes= subdiv 16). The default is 1.
</p>
<p>
<span class="emphasis"><em>istutterchance</em></span> -- (optional, default=0) The tail of a phrase has this chance of becoming a single repeating one unit cell stutter (0.0 to 1.0). The default is 0.
</p>
<p>
<span class="emphasis"><em>ienvchoice</em></span> -- (optional, default=1) choose 1 for on (exponential envelope for cut grains) or 0 for off. Off will cause clicking, but may give good noisy results, especially for percussive sources. The default is 1, on.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp14505752"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asource</em></span> -- The audio signal to be cut up. This version runs in real-time without knowledge of future audio.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp14506664"></a>
<h2>Examples</h2>
<p>
Here is a simple example of the bbcutm opcode. It uses the file <a class="ulink" href="examples/bbcutm.csd" target="_top"><em class="citetitle">bbcutm.csd</em></a>, and <a class="ulink" href="examples/beats.wav" target="_top"><em class="citetitle">beats.wav</em></a>.
</p>
<div class="example">
<a id="idp14508072"></a>
<p class="title">
<strong>Example 70. A simple example of the bbcutm opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
<span class="comment">; Audio out Audio in No messages</span>
-odac -iadc -d <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o bbcutm.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Instrument #1 - Play an audio file normally.</span>
<span class="oblock">instr</span> 1
asource <span class="opc">soundin</span> "beats.wav"
<span class="opc">out</span> asource
<span class="oblock">endin</span>
<span class="comment">; Instrument #2 - Cut-up an audio file.</span>
<span class="oblock">instr</span> 2
asource <span class="opc">soundin</span> "beats.wav"
ibps <span class="op">=</span> 4
isubdiv <span class="op">=</span> 8
ibarlength <span class="op">=</span> 4
iphrasebars <span class="op">=</span> 1
inumrepeats <span class="op">=</span> 2
a1 <span class="opc">bbcutm</span> asource, ibps, isubdiv, ibarlength, iphrasebars, inumrepeats
<span class="opc">out</span> a1
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Play Instrument #1 for two seconds.</span>
<span class="stamnt">i</span> 1 0 2
<span class="comment">; Play Instrument #2 for two seconds.</span>
<span class="stamnt">i</span> 2 3 2
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
<p>
Here are some more advanced examples...
</p>
<div class="example">
<a id="idp14510480"></a>
<p class="title">
<strong>Example 71. First steps- mono and stereo versions</strong>
</p>
<div class="example-contents">
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="oblock">instr</span> 1
asource <span class="opc">diskin</span> "break7.wav",1,0,1 <span class="comment">; a source breakbeat sample, wraparound lest it stop!</span>
<span class="comment">; cuts in eighth notes per 4/4 bar, up to 4 bar phrases, up to 1</span>
<span class="comment">; repeat in total (standard use) rare stuttering at 16 note speed,</span>
<span class="comment">; no enveloping</span>
asig <span class="opc">bbcutm</span> asource, 2.6937, 8, 4, 4, 1, 2, 0.1, 0
<span class="opc">outs</span> asig,asig
<span class="oblock">endin</span>
<span class="oblock">instr</span> 2 <span class="comment">;stereo version</span>
asource1,asource2 <span class="opc">diskin</span> "break7stereo.wav", 1, 0, 1 <span class="comment">; a source breakbeat sample, wraparound lest it stop!</span>
<span class="comment">; cuts in eighth notes per 4/4 bar, up to 4 bar phrases, up to 1</span>
<span class="comment">; repeat in total (standard use) rare stuttering at 16 note speed,</span>
<span class="comment">; no enveloping</span>
asig1,asig2 <span class="opc">bbcuts</span> asource1, asource2, 2.6937, 8, 4, 4, 1, 2, 0.1, 0
<span class="opc">outs</span> asig1,asig2
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span>1 0 10
<span class="stamnt">i</span>2 11 10
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span></pre>
</div>
</div>
<p><br class="example-break" />
</p>
<p>
</p>
<div class="example">
<a id="idp14524424"></a>
<p class="title">
<strong>Example 72. Multiple simultaneous synchronised breaks</strong>
</p>
<div class="example-contents">
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="oblock">instr</span> 1
ibps <span class="op">=</span> 2.6937
iplaybackspeed <span class="op">=</span> ibps<span class="op">/</span>p5
asource <span class="opc">diskin</span> p4, iplaybackspeed, 0, 1
asig <span class="opc">bbcutm</span> asource, 2.6937, p6, 4, 4, p7, 2, 0.1, 1
<span class="opc">out</span> asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; source bps cut repeats</span>
<span class="stamnt">i</span>1 0 10 "break1.wav" 2.3 8 2 <span class="Ccomment">//2.3 is the source original tempo</span>
<span class="stamnt">i</span>1 0 10 "break2.wav" 2.4 8 3
<span class="stamnt">i</span>1 0 10 "break3.wav" 2.5 16 4
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span></pre>
</div>
</div>
<p><br class="example-break" />
</p>
<p>
</p>
<div class="example">
<a id="idp14535168"></a>
<p class="title">
<strong>Example 73. Cutting up any old audio- much more interesting noises than this should be possible!</strong>
</p>
<div class="example-contents">
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="oblock">instr</span> 1
asource <span class="opc">oscil</span> 20000, 70, 1
<span class="comment">; ain, bps, subdiv, barlength, phrasebars, numrepeats,</span>
<span class="comment">;stutterspeed, stutterchance, envelopingon</span>
asig <span class="opc">bbcutm</span> asource, 2, 32, 1, 1, 2, 4, 0.6, 1
<span class="opc">outs</span> asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span>1 0 256 10 1
<span class="stamnt">i</span>1 0 10
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span></pre>
</div>
</div>
<p><br class="example-break" />
</p>
<p>
</p>
<div class="example">
<a id="idp14544584"></a>
<p class="title">
<strong>Example 74. Constant stuttering- faked, not possible since can only stutter in last half bar could make extra stuttering option parameter</strong>
</p>
<div class="example-contents">
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="oblock">instr</span> 1
asource <span class="opc">diskin</span> "break7.wav", 1, 0, 1
<span class="comment">;16th note cuts- but cut size 2 over half a beat.</span>
<span class="comment">;each half beat will either survive intact or be turned into</span>
<span class="comment">;the first sixteenth played twice in succession</span>
asig <span class="opc">bbcutm</span> asource, 2.6937, 2, 0.5, 1, 2, 2, 1.0, 0
<span class="opc">outs</span> asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span>1 0 30
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span></pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp14554040"></a>
<h2>See Also</h2>
<p>
<a class="link" href="bbcuts.html" title="bbcuts"><em class="citetitle">bbcuts</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp14555096"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Nick Collins</td>
</tr>
<tr>
<td>London</td>
</tr>
<tr>
<td>August 2001</td>
</tr>
</table>
<p>
</p>
<p>New in version 4.13</p>
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