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<refentry id="shaker">
<indexterm id="IndexShaker"><primary>shaker</primary></indexterm>
<refentryinfo><title>Signal Generators:Models and Emulations</title></refentryinfo>
<refmeta>
<refentrytitle>shaker</refentrytitle>
</refmeta>
<refnamediv>
<refname>shaker</refname>
<refpurpose>
Sounds like the shaking of a maraca or similar gourd instrument.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
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 &nameperry;, but re-coded for Csound.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>ares <command>shaker</command> kamp, kfreq, kbeans, kdamp, ktimes [, idecay]</synopsis>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>idecay</emphasis> -- If present indicates for how long at the end of the note the shaker is to be damped. The default value is zero.
</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
A note is played on a maraca-like instrument, with the arguments as below.
</para>
<para>
<emphasis>kamp</emphasis> -- Amplitude of note.
</para>
<para>
<emphasis>kfreq</emphasis> -- Frequency of note played.
</para>
<para>
<emphasis>kbeans</emphasis> -- The number of beans in the gourd. A value of 8 seems suitable,
</para>
<para>
<emphasis>kdamp</emphasis> -- The damping value of the shaker. Values of 0.98 to 1 seems suitable, with 0.99 a reasonable default.
</para>
<para>
<emphasis>ktimes</emphasis> -- Number of times shaken.
</para>
<note>
<title>Note</title>
<para>
The argument <emphasis>knum</emphasis> was redundant, so it was removed in version 3.49.
</para>
</note>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Here is an example of the shaker opcode. It uses the file <ulink url="examples/shaker.csd"><citetitle>shaker.csd</citetitle></ulink>.
<example>
<title>Example of the shaker opcode.</title>
<para>See the sections <link linkend="UsingRealTime"><citetitle>Real-time Audio</citetitle></link> and <link linkend="CommandFlags"><citetitle>Command Line Flags</citetitle></link> for more information on using command line flags.</para>
<xi:include href="examples-xml/shaker.csd.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
</example>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>
<simplelist>
<member>Author: &namejohn; (after &nameperry;)</member>
<member>University of Bath, Codemist Ltd.</member>
<member>Bath, UK</member>
</simplelist>
</para>
<para>New in Csound version 3.47</para>
<para>Fixed the example thanks to a message from &nameistvan;.</para>
</refsect1>
</refentry>
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