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<refentry id="metro">
<indexterm id="IndexMetro"><primary>metro</primary></indexterm>
<refentryinfo><title>Instrument Control:Sensing and Control</title></refentryinfo>
<refmeta>
<refentrytitle>metro</refentrytitle>
</refmeta>
<refnamediv>
<refname>metro</refname>
<refpurpose>
Trigger Metronome
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
Generate a metronomic signal to be used in any circumstance an isochronous trigger is needed.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>ktrig <command>metro</command> kfreq [, initphase]</synopsis>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>initphase</emphasis> - initial phase value (in the 0 to 1 range)
</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
<emphasis>ktrig</emphasis> - output trigger signal
</para>
<para>
<emphasis>kfreq</emphasis> - frequency of trigger bangs in cps
</para>
<para>
<emphasis>metro</emphasis> is a simple opcode that outputs a sequence of isochronous bangs (that is 1 values) each 1/kfreq seconds. Trigger signals can be used in any circumstance, mainly to temporize realtime algorithmic compositional structures.
</para>
<note>
<para>
<emphasis>metro</emphasis> will produce a trigger signal of 1 when its phase is exactly 0 or 1. If you want to skip the initial trigger, use a very small value like 0.00000001.
</para>
</note>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Here is an example of the metro opcode. It uses the file <ulink url="examples/metro.csd"><citetitle>metro.csd</citetitle></ulink>
<example>
<title>Example of the metro opcode.</title>
<xi:include href="examples-xml/metro.csd.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
</example>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>Written by &namegabriel;.</para>
<para>Example written by &nameandres;.</para>
<para>New in Csound 5 (Previously available only on CsoundAV)</para>
</refsect1>
</refentry>
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