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<div class="refentry" title="syncloop">
<a id="syncloop"></a>
<div class="titlepage"></div>
<a id="IndexSyncloop" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">syncloop</span>
</h2>
<p>syncloop —
Synchronous granular synthesis.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp46884960"></a>
<h2>Description</h2>
<p>
<span class="emphasis"><em>syncloop</em></span> is a variation on <span class="emphasis"><em>syncgrain</em></span>,
which implements synchronous granular synthesis.
<span class="emphasis"><em>syncloop</em></span> adds loop start and end points and an optional start position. Loop start
and end control grain start positions, so the actual grains can go beyond the loop
points (if the loop points are not at the extremes of the table), enabling
seamless crossfading. For more information on the granular synthesis process,
check the <a class="link" href="syncgrain.html" title="syncgrain"><em class="citetitle">syncgrain</em></a> manual page.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp46938072"></a>
<h2>Syntax</h2>
<pre class="synopsis">asig <span class="command"><strong>syncloop</strong></span> kamp, kfreq, kpitch, kgrsize, kprate, klstart, \
klend, ifun1, ifun2, iolaps[,istart, iskip]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp46939256"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ifun1</em></span> -- source signal function table. Deferred-allocation tables (see
<a class="link" href="GEN01.html" title="GEN01"><em class="citetitle">GEN01</em></a>)
are accepted, but the opcode expects a mono source.
</p>
<p>
<span class="emphasis"><em>ifun2</em></span> -- grain envelope function table.
</p>
<p>
<span class="emphasis"><em>iolaps</em></span> -- maximum number of overlaps,
max(<span class="emphasis"><em>kfreq</em></span>)*max(<span class="emphasis"><em>kgrsize</em></span>). Estimating
a large value should not affect performance, but execeeding this value will probably have disastrous
consequences.
</p>
<p>
<span class="emphasis"><em>istart</em></span> -- starting point of synthesis in secs (defaults to 0).
</p>
<p>
<span class="emphasis"><em>iskip </em></span> -- if 1, the opcode initialisation is skipped, for tied notes, performance
continues from the position in the loop where the previous note stopped. The default, 0, does not skip
initialisation
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp46943248"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kamp</em></span> -- amplitude scaling
</p>
<p>
<span class="emphasis"><em>kfreq</em></span> -- frequency of grain generation, or density, in grains/sec.
</p>
<p>
<span class="emphasis"><em>kpitch</em></span> -- grain pitch scaling (1=normal pitch, < 1 lower, > 1 higher; negative, backwards)
</p>
<p>
<span class="emphasis"><em>kgrsize</em></span> -- grain size in secs.
</p>
<p>
<span class="emphasis"><em>kprate</em></span> -- readout pointer rate, in grains. The value of 1 will advance
the reading pointer 1 grain ahead in the source table. Larger values
will time-compress and smaller values will time-expand the source signal.
Negative values will cause the pointer to run backwards and zero will
freeze it.
</p>
<p>
<span class="emphasis"><em>klstart</em></span> -- loop start in secs.
</p>
<p>
<span class="emphasis"><em>klend</em></span> -- loop end in secs.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp46947240"></a>
<h2>Examples</h2>
<p>
Here is an example of the syncloop opcode. It uses the file <a class="ulink" href="examples/syncloop.csd" target="_top"><em class="citetitle">syncloop.csd</em></a>.
</p>
<div class="example">
<a id="idp46948224"></a>
<p class="title">
<strong>Example 842. Example of the syncloop 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">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o syncloop.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">0dbfs</span> <span class="op">=</span> 1
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="oblock">instr</span> 1
iolaps <span class="op">=</span> 2
igrsize <span class="op">=</span> 0.01
ifreq <span class="op">=</span> iolaps<span class="op">/</span>igrsize
ips <span class="op">=</span> 1<span class="op">/</span>iolaps
istr <span class="op">=</span> p4 <span class="op">/</span><span class="op">*</span> timescale <span class="op">*</span><span class="op">/</span>
ipitch <span class="op">=</span> 1 <span class="op">/</span><span class="op">*</span> pitchscale <span class="op">*</span><span class="op">/</span>
asig <span class="opc">syncloop</span> 1, ifreq, ipitch, igrsize, ips<span class="op">*</span>istr, .3, .75, 1, 2, iolaps
<span class="opc">outs</span> asig, asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span>1 0 0 1 "beats.wav" 0 0 0
<span class="stamnt">f</span>2 0 8192 20 2 1
<span class="stamnt">i</span>1 0 6 .5
<span class="stamnt">i</span>1 7 6 .15
<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="Credits">
<a id="idp46950504"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Victor Lazzarini</td>
</tr>
<tr>
<td>January 2005</td>
</tr>
</table>
<p>
</p>
<p>New plugin in version 5</p>
<p>January 2005.</p>
</div>
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