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<div class="refentry" title="shaker">
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<h2>
<span class="refentrytitle">shaker</span>
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<p>shaker —
Sounds like the shaking of a maraca or similar gourd instrument.
</p>
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<div class="refsect1" title="Description">
<a id="idp42966408"></a>
<h2>Description</h2>
<p>
Audio output is a tone related to the shaking of a maraca or similar gourd instrument. The method is a physically inspired model developed from Perry Cook, but re-coded for Csound.
</p>
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<div class="refsect1" title="Syntax">
<a id="idp42966936"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>shaker</strong></span> kamp, kfreq, kbeans, kdamp, ktimes [, idecay]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp43016312"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>idecay</em></span> -- If present indicates for how long at the end of the note the shaker is to be damped. The default value is zero.
</p>
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<div class="refsect1" title="Performance">
<a id="idp43017232"></a>
<h2>Performance</h2>
<p>
A note is played on a maraca-like instrument, with the arguments as below.
</p>
<p>
<span class="emphasis"><em>kamp</em></span> -- Amplitude of note.
</p>
<p>
<span class="emphasis"><em>kfreq</em></span> -- Frequency of note played.
</p>
<p>
<span class="emphasis"><em>kbeans</em></span> -- The number of beans in the gourd. A value of 8 seems suitable.
</p>
<p>
<span class="emphasis"><em>kdamp</em></span> -- The damping value of the shaker. Values of 0.98 to 1 seems suitable, with 0.99 a reasonable default.
</p>
<p>
<span class="emphasis"><em>ktimes</em></span> -- Number of times shaken.
</p>
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<th align="left">Note</th>
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<p>
The argument <span class="emphasis"><em>knum</em></span> was redundant, so it was removed in version 3.49.
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<div class="refsect1" title="Examples">
<a id="idp43021128"></a>
<h2>Examples</h2>
<p>
Here is an example of the shaker opcode. It uses the file <a class="ulink" href="examples/shaker.csd" target="_top"><em class="citetitle">shaker.csd</em></a>.
</p>
<div class="example">
<a id="idp43022096"></a>
<p class="title">
<strong>Example 773. Example of the shaker 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 shaker.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</span>
<span class="oblock">instr</span> 1
kfreq <span class="opc">line</span> p4, p3, 440
a1 <span class="opc">shaker</span> 10000, kfreq, 8, 0.999, 100, 0
<span class="opc">out</span> a1
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 1 440
<span class="stamnt">i</span> 1 + 1 4000
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
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<p><br class="example-break" />
</p>
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<div class="refsect1" title="Credits">
<a id="idp43024368"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
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<td>Author: John ffitch (after Perry Cook)</td>
</tr>
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<td>University of Bath, Codemist Ltd.</td>
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<td>Bath, UK</td>
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<p>
</p>
<p>New in Csound version 3.47</p>
<p>Fixed the example thanks to a message from Istvan Varga.</p>
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