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<refentry id="STKFMVoices">
<indexterm id="IndexStkfmvoices"><primary>STKFMVoices</primary></indexterm>
<refentryinfo><title>Signal Generators:STK Opcodes</title></refentryinfo>
<refmeta>
<refentrytitle>STKFMVoices</refentrytitle>
</refmeta>
<refnamediv>
<refname>STKFMVoices</refname>
<refpurpose>
STKFMVoices is a singing FM synthesis instrument.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
STKFMVoices is a singing FM synthesis instrument. It has 3 carriers and a common modulator, also referred to as algorithm 6 of the TX81Z.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>asignal <command>STKFMVoices</command> ifrequency, iamplitude, [kc1, kv1[, kc2, kv2[, kc3, kv3[, kc4, kv4[, kc5, kv5]]]]]</synopsis>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>ifrequency</emphasis> -- Frequency of note played, in Hertz.
</para>
<para>
<emphasis>iamplitude</emphasis> -- Amplitude of note played (range 0-1).
</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
<emphasis>kc1, kv1, kc2, kv2, kc3, kv3, kc4, kv4, kc5, kv5, kc6, kv6, kc7, kv7, kc8, kv8</emphasis> -- Up to 8 optional k-rate controller pairs for the STK opcodes.
Each controller pair consists of a controller number (kc) followed by a controller value (kv). The 5 controller numbers and values that work for STKFMVoices are:
<itemizedlist>
<listitem><para><emphasis>kc, kv</emphasis> -- 2, vowel.</para></listitem>
<listitem><para><emphasis>kc, kv</emphasis> -- 4, spectral tilt </para></listitem>
<listitem><para><emphasis>kc, kv</emphasis> -- 11, speed of low-frequency oscillator.</para></listitem>
<listitem><para><emphasis>kc, kv</emphasis> -- 1, depth of low-frequency oscillator.</para></listitem>
<listitem><para><emphasis>kc, kv</emphasis> -- 128, ADSR 2 and 4 Target.</para></listitem>
</itemizedlist>
</para>
</refsect1>
<refsect1>
<note>
<title>Note</title>
<para>
The code for this opcode is taken directly from the FMVoices class in the Synthesis Toolkit in C++ by Perry R. Cook and Gary P. Scavone. More on the STK classes can be found here:
<ulink url="https://ccrma.stanford.edu/software/stk/classes.html"><citetitle>https://ccrma.stanford.edu/software/stk/classes.html</citetitle></ulink>
</para>
</note>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Here is an example of the STKFMVoices opcode. It uses the file <ulink url="examples/STKFMVoices.csd"><citetitle>STKFMVoices.csd</citetitle></ulink>, and <ulink url="examples/fwavblnk.aiff"><citetitle>fwavblnk.aiff</citetitle></ulink>.
<example>
<title>Example of the STKFMVoices opcode.</title>
<xi:include href="examples-xml/STKFMVoices.csd.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
</example>
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<link linkend="STKBeeThree"><citetitle>STKBeeThree</citetitle></link>,
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>
<simplelist>
<member>Author: &namemichael; (after &nameperry;)</member>
<member>Irreducible Productions</member>
<member>New York, NY</member>
</simplelist>
</para>
<para>New in Csound version 5.11</para>
</refsect1>
</refentry>
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