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<div class="refentry" title="sndloop">
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<h2>
<span class="refentrytitle">sndloop</span>
</h2>
<p>sndloop —
A sound looper with pitch control.
</p>
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<div class="refsect1" title="Description">
<a id="id3212275"></a>
<h2>Description</h2>
<p>
This opcode records input audio and plays it back in a loop with user-defined
duration and crossfade time. It also allows the pitch of the loop to be controlled,
including reversed playback.
</p>
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<div class="refsect1" title="Syntax">
<a id="id3212289"></a>
<h2>Syntax</h2>
<pre class="synopsis">asig, krec <span class="command"><strong>sndloop</strong></span> ain, kpitch, ktrig, idur, ifad</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="id3213209"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>idur </em></span> -- loop duration in seconds
</p>
<p>
<span class="emphasis"><em>ifad </em></span> -- crossfade duration in seconds
</p>
</div>
<div class="refsect1" title="Performance">
<a id="id3213230"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig</em></span> -- output sig
</p>
<p>
<span class="emphasis"><em>krec</em></span> -- 'rec on' signal, 1 when recording, 0 otherwise
</p>
<p>
<span class="emphasis"><em>kpitch</em></span> -- pitch control (transposition ratio); negative values play the loop back in reverse
</p>
<p>
<span class="emphasis"><em>ktrig</em></span> -- trigger signal: when 0, processing is bypassed. When switched on (ktrig >= 1),
the opcode starts recording until the loop memory is full. It then plays
the looped sound until it is switched off again (ktrig = 0). Another recording
can start again with ktrig >= 1.
</p>
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<div class="refsect1" title="Examples">
<a id="id3213272"></a>
<h2>Examples</h2>
<p>
</p>
<div class="example">
<a id="id3213280"></a>
<p class="title">
<b>Example 562. Example</b>
</p>
<div class="example-contents">
<pre class="programlisting">
asig <span class="opc">in</span> <span class="comment">; get the signal in</span>
ktrig <span class="opc">line</span> 0, 1, 1 <span class="comment">; trigger signal</span>
aout,krec <span class="opc">sndloop</span> asig, 1, ktrig, 4, 0.05 <span class="comment">; rec starts at 1 sec, for 4 secs 0.05 crossfade</span>
<span class="opc">printk</span> 1, krec <span class="comment">; prints the recording signal</span>
<span class="opc">out</span> aout</pre>
</div>
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<p><br class="example-break" />
</p>
<p>
The example above shows the basic operation of sndloop. Pitch can
be controlled at the k-rate, recording is started as soon as the
trigger value is >= 1. Recording can be restarted by making the trigger 0 and
then 1 again.
</p>
</div>
<div class="refsect1" title="Credits">
<a id="id3213356"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Victor Lazzarini</td>
</tr>
<tr>
<td>April 2005 </td>
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<p>
</p>
<p>New in Version 5.00</p>
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