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<refentry id="wgbow">
<indexterm id="IndexWgbow"><primary>wgbow</primary></indexterm>
<refentryinfo><title>Signal Generators:Waveguide Physical Modeling</title></refentryinfo>
<refmeta>
<refentrytitle>wgbow</refentrytitle>
</refmeta>
<refnamediv>
<refname>wgbow</refname>
<refpurpose>
Creates a tone similar to a bowed string.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
Audio output is a tone similar to a bowed string, using a physical model developed from &nameperry;, but re-coded for Csound.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>ares <command>wgbow</command> kamp, kfreq, kpres, krat, kvibf, kvamp, ifn [, iminfreq]</synopsis>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>ifn</emphasis> -- table of shape of vibrato, usually a sine table, created by a function
</para>
<para>
<emphasis>iminfreq</emphasis> (optional) -- lowest frequency at which the instrument will play. If it is omitted it is taken to be the same as the initial <emphasis>kfreq</emphasis>. If <emphasis>iminfreq</emphasis> is negative, initialization will be skipped.
</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
A note is played on a string-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>kpres</emphasis> -- a parameter controlling the pressure of the bow on the string. Values should be about 3. The useful range is approximately 1 to 5.
</para>
<para>
<emphasis>krat</emphasis> -- the position of the bow along the string. Usual playing is about 0.127236. The suggested range is 0.025 to 0.23.
</para>
<para>
<emphasis>kvibf</emphasis> -- frequency of vibrato in Hertz. Suggested range is 0 to 12
</para>
<para>
<emphasis>kvamp</emphasis> -- amplitude of the vibrato
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Here is an example of the wgbow opcode. It uses the file <ulink url="examples/wgbow.csd"><citetitle>wgbow.csd</citetitle></ulink>.
<example>
<title>Example of the wgbow 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/wgbow.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>
</refsect1>
</refentry>
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