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<refentry id="GEN18">
<indexterm id="IndexGEN18"><primary>GEN18</primary></indexterm>
<refmeta>
<refentrytitle>GEN18</refentrytitle>
</refmeta>
<refnamediv>
<refname>GEN18</refname>
<refpurpose>
Writes composite waveforms made up of pre-existing waveforms.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
Writes composite waveforms made up of pre-existing waveforms. Each contributing waveform requires 4 pfields and can overlap with other waveforms.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis><command>f</command> # time size 18 fna ampa starta finisha fnb ampb startb finishb ...</synopsis>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>size</emphasis> -- number of points in the table. Must be a power-of-2 plus 1 (see <link linkend="f">f</link> statement).
</para>
<para>
<emphasis>fna, fnb, etc.</emphasis> -- pre-existing table number to be written into the table.
</para>
<para>
<emphasis>ampa, ampb, etc.</emphasis> -- strength of wavefoms. These are relative strengths, since the composite waveform may be rescaled later. Negative values are permitted and imply a 180 degree phase shift.
</para>
<para>
<emphasis>starta, startb, etc.</emphasis> -- where to start writing the fn into the table.
</para>
<para>
<emphasis>finisha, finishb, etc.</emphasis> -- where to stop writing the fn into the table.
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
<informalexample>
<programlisting>
<emphasis role="stamnt">f</emphasis> 1 0 4096 10 1
<emphasis role="stamnt">f</emphasis> 2 0 1025 18 1 1 0 512 1 1 513 1025</programlisting>
</informalexample>
f2 consists of two copies of f1 written in to locations 0-512 and 513-1025.
</para>
</refsect1>
<refsect1>
<title>Deprecated Names</title>
<para>
<emphasis>GEN18</emphasis> was called <emphasis>GEN22</emphasis> in version 4.18. The name was changed due to a conflict with DirectCsound.
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>
<simplelist>
<member>Author: William <quote>Pete</quote> Moss</member>
<member>University of Texas at Austin</member>
<member>Austin, Texas USA</member>
<member>January 2002</member>
</simplelist>
</para>
<para>New in version 4.18, changed in version 4.19</para>
</refsect1>
</refentry>
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