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<refentry id="trigseq">
<indexterm id="IndexTrigseq"><primary>trigseq</primary></indexterm>
<refentryinfo><title>Instrument Control:Sensing and Control</title></refentryinfo>
<refmeta>
<refentrytitle>trigseq</refentrytitle>
</refmeta>
<refnamediv>
<refname>trigseq</refname>
<refpurpose>
Accepts a trigger signal as input and outputs a group of values.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
Accepts a trigger signal as input and outputs a group of values.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis><command>trigseq</command> ktrig_in, kstart, kloop, kinitndx, kfn_values, kout1 [, kout2] [...]</synopsis>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
<emphasis>ktrig_in</emphasis> -- input trigger signal
</para>
<para>
<emphasis>kstart</emphasis> -- start index of looped section
</para>
<para>
<emphasis>kloop</emphasis> -- end index of looped section
</para>
<para>
<emphasis>kinitndx</emphasis> -- initial index
</para>
<note>
<title>Note</title>
<para>
Although <emphasis>kinitndx</emphasis> is listed as k-rate, it is in fact accessed only at init-time. So if you are using a k-rate argument, it must be assigned with <link linkend="init"><citetitle>init</citetitle></link>.
</para>
</note>
<para>
<emphasis>kfn_values</emphasis> -- number of a table containing a sequence of groups of values
</para>
<para>
<emphasis>kout1</emphasis> -- output values
</para>
<para>
<emphasis>kout2, ...</emphasis> (optional) -- more output values
</para>
<para>
This opcode handles timed-sequences of groups of values stored into a table.
</para>
<para>
<emphasis>trigseq</emphasis> accepts a trigger signal (<emphasis>ktrig_in</emphasis>) as input and outputs group of values (contained in the <emphasis>kfn_values</emphasis> table) each time <emphasis>ktrig_in</emphasis> assumes a non-zero value. Each time a group of values is triggered, table pointer is advanced of a number of positions corresponding to the number of group-elements, in order to point to the next group of values. The number of elements of groups is determined by the number of <emphasis>koutX</emphasis> arguments.
</para>
<para>
It is possible to start the sequence from a value different than the first, by assigning to <emphasis>kinitndx</emphasis> an index different than zero (which corresponds to the first value of the table). Normally the sequence is looped, and the start and end of loop can be adjusted by modifying <emphasis>kstart</emphasis> and <emphasis>kloop</emphasis> arguments. User must be sure that values of these arguments (as well as <emphasis>kinitndx</emphasis>) correspond to valid table numbers, otherwise Csound will crash because no range-checking is implemented.
</para>
<para>
It is possible to disable loop (one-shot mode) by assigning the same value both to <emphasis>kstart</emphasis> and <emphasis>kloop</emphasis> arguments. In this case, the last read element will be the one corresponding to the value of such arguments. Table can be read backward by assigning a negative <emphasis>kloop</emphasis> value.
</para>
<para>
<emphasis>trigseq</emphasis> is designed to be used together with <link linkend="seqtime"><citetitle>seqtime</citetitle></link> or <link linkend="trigger"><citetitle>trigger</citetitle></link> opcodes.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<link linkend="seqtime"><citetitle>seqtime</citetitle></link>,
<link linkend="trigger"><citetitle>trigger</citetitle></link>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>Author: &namegabriel;</para>
<para>November 2002. Added a note about the <emphasis>kinitndx</emphasis> parameter, thanks to &namerasmus;.</para>
<para>January 2003. Thanks to a note from &nameoeyvind;, I corrected the credits.</para>
<para>New in version 4.06</para>
</refsect1>
</refentry>
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