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<div class="refentry" title="bbcuts">
<a id="bbcuts"></a>
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<a id="IndexBbcuts" class="indexterm"></a>
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<h2>
<span class="refentrytitle">bbcuts</span>
</h2>
<p>bbcuts —
Generates breakbeat-style cut-ups of a stereo audio stream.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp14590880"></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="idp14627792"></a>
<h2>Syntax</h2>
<pre class="synopsis">a1,a2 <span class="command"><strong>bbcuts</strong></span> asource1, asource2, ibps, isubdiv, ibarlength, iphrasebars, \
inumrepeats [, istutterspeed] [, istutterchance] [, ienvchoice]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp14629032"></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="idp14633912"></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="idp14634824"></a>
<h2>Examples</h2>
<p>
Here is an example of the bbcuts opcode. It uses the file <a class="ulink" href="examples/bbcuts.csd" target="_top"><em class="citetitle">bbcuts.csd</em></a>.
</p>
<div class="example">
<a id="idp14635792"></a>
<p class="title">
<strong>Example 75. Example of the bbcuts 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>
-odac <span class="comment">;;;RT audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o bbcuts.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="oblock">instr</span> 1 <span class="comment">;Play an audio file</span>
aleft, aright <span class="opc">diskin2</span> "kickroll.wav", 1, 0
<span class="opc">outs</span> aleft, aright
<span class="oblock">endin</span>
<span class="oblock">instr</span> 2 <span class="comment">;Cut-up stereo audio file.</span>
ibps <span class="op">=</span> 16
isubdiv <span class="op">=</span> 2
ibarlength <span class="op">=</span> 2
iphrasebars <span class="op">=</span> 1
inumrepeats <span class="op">=</span> 8
aleft, aright <span class="opc">diskin2</span> "kickroll.wav", 1, 0
aleft, aright <span class="opc">bbcuts</span> aleft, aright, ibps, isubdiv, ibarlength, iphrasebars, inumrepeats
<span class="opc">outs</span> aleft, aright
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 2
<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>
</div>
<div class="refsect1" title="See Also">
<a id="idp14638064"></a>
<h2>See Also</h2>
<p>
<a class="link" href="bbcutm.html" title="bbcutm"><em class="citetitle">bbcutm</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp14639080"></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>
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<td>August 2001</td>
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<p>
</p>
<p>New in version 4.13</p>
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