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<div class="refentry" title="trigseq">
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<h2>
<span class="refentrytitle">trigseq</span>
</h2>
<p>trigseq —
Accepts a trigger signal as input and outputs a group of values.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp49444488"></a>
<h2>Description</h2>
<p>
Accepts a trigger signal as input and outputs a group of values.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp49445168"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>trigseq</strong></span> ktrig_in, kstart, kloop, kinitndx, kfn_values, kout1 [, kout2] [...]</pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp49455576"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>ktrig_in</em></span> -- input trigger signal
</p>
<p>
<span class="emphasis"><em>kstart</em></span> -- start index of looped section
</p>
<p>
<span class="emphasis"><em>kloop</em></span> -- end index of looped section
</p>
<p>
<span class="emphasis"><em>kinitndx</em></span> -- initial index
</p>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Note: Note">
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<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Note]" src="images/note.png" />
</td>
<th align="left">Note</th>
</tr>
<tr>
<td align="left" valign="top">
<p>
Although <span class="emphasis"><em>kinitndx</em></span> 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 <a class="link" href="init.html" title="init"><em class="citetitle">init</em></a>.
</p>
</td>
</tr>
</table>
</div>
<p>
<span class="emphasis"><em>kfn_values</em></span> -- number of a table containing a sequence of groups of values
</p>
<p>
<span class="emphasis"><em>kout1</em></span> -- output values
</p>
<p>
<span class="emphasis"><em>kout2, ...</em></span> (optional) -- more output values
</p>
<p>
This opcode handles timed-sequences of groups of values stored into a table.
</p>
<p>
<span class="emphasis"><em>trigseq</em></span> accepts a trigger signal (<span class="emphasis"><em>ktrig_in</em></span>) as input and outputs group of values (contained in the <span class="emphasis"><em>kfn_values</em></span> table) each time <span class="emphasis"><em>ktrig_in</em></span> 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 <span class="emphasis"><em>koutX</em></span> arguments.
</p>
<p>
It is possible to start the sequence from a value different than the first, by assigning to <span class="emphasis"><em>kinitndx</em></span> 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 <span class="emphasis"><em>kstart</em></span> and <span class="emphasis"><em>kloop</em></span> arguments. User must be sure that values of these arguments (as well as <span class="emphasis"><em>kinitndx</em></span>) correspond to valid table numbers, otherwise Csound will crash because no range-checking is implemented.
</p>
<p>
It is possible to disable loop (one-shot mode) by assigning the same value both to <span class="emphasis"><em>kstart</em></span> and <span class="emphasis"><em>kloop</em></span> 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 <span class="emphasis"><em>kloop</em></span> value.
</p>
<p>
<span class="emphasis"><em>trigseq</em></span> is designed to be used together with <a class="link" href="seqtime.html" title="seqtime"><em class="citetitle">seqtime</em></a> or <a class="link" href="trigger.html" title="trigger"><em class="citetitle">trigger</em></a> opcodes.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp49549296"></a>
<h2>Examples</h2>
<p>
Here is an example of the trigseq opcode. It uses the file <a class="ulink" href="examples/trigseq.csd" target="_top"><em class="citetitle">trigseq.csd</em></a>.
</p>
<div class="example">
<a id="idp49550272"></a>
<p class="title">
<strong>Example 899. Example of the trigseq opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o trigseq.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
giTimes <span class="ohdr">ftgen</span> 91, 0, 128, <span class="op">-</span>2, 1, 1<span class="op">/</span>2, 1<span class="op">/</span>2, 1<span class="op">/</span>8, 1<span class="op">/</span>8, 1<span class="op">/</span>2,1<span class="op">/</span>2, 1<span class="op">/</span>16, 1<span class="op">/</span>16, 1<span class="op">/</span>16, 1<span class="op">/</span>16, 1<span class="op">/</span>16, 1<span class="op">/</span>16, 1<span class="op">/</span>16, 1<span class="op">/</span>16<span class="comment">; times</span>
giSeq <span class="ohdr">ftgen</span> 90, 0, 128, <span class="op">-</span>2, 1, 2, .5, 3, .25, 4, .10, 5, .05, 6, <span class="comment">;** sequence amplitude and freq-ratio bins</span>
<span class="oblock">instr</span> 1
icps <span class="opc">init</span> p4
iamp <span class="opc">init</span> .3
kloop <span class="opc">init</span> p5
initndx <span class="opc">init</span> p6
kloop2 <span class="opc">init</span> p7
initndx2 <span class="opc">init</span> p8
kdur <span class="opc">init</span> p9
iminTime <span class="opc">init</span> p10
imaxTime <span class="opc">init</span> p11
kampratio <span class="opc">init</span> 1
kfreqratio <span class="opc">init</span> 1
ktime_unit <span class="opc">expseg</span> iminTime,p3<span class="op">/</span>8,iminTime,p3<span class="op">*</span> 3<span class="op">/</span>4,imaxTime,p3<span class="op">/</span>8,imaxTime
<span class="comment">;**ktrig seqtime ktime_unit, kstart, kloop, initndx, kfn_times </span>
<span class="comment">;ktrig seqtime 1/ktime_unit, 0, 15, 0, giTimes </span>
ktrig <span class="opc">metro</span> ktime_unit
<span class="comment">;**** trigseq ktrig_in, kstart, kloop, initndx, kfn_values, kout1 [, kout2, kout3, ...., koutN] </span>
<span class="opc">trigseq</span> ktrig, 0, kloop2,initndx2, giSeq, kampratio, kfreqratio
<span class="comment">;atrig = ktrig*10000</span>
<span class="opc">schedkwhen</span> ktrig, <span class="op">-</span>1, <span class="op">-</span>1, 3, 0, kdur, kampratio<span class="op">*</span>iamp, kfreqratio<span class="op">*</span>icps
<span class="comment">; schedkwhen ktrig, -1, -1, 2, 0, ktrig, kampratio*iamp, kfreqratio*icps</span>
<span class="oblock">endin</span>
<span class="oblock">instr</span> 2
icps <span class="opc">init</span> p4
iamp <span class="opc">init</span> 20000
kloop <span class="opc">init</span> p5
initndx <span class="opc">init</span> p6
kloop2 <span class="opc">init</span> p7
initndx2 <span class="opc">init</span> p8
kdur <span class="opc">init</span> p9
iminTime <span class="opc">init</span> p10
imaxTime <span class="opc">init</span> p11
kampratio <span class="opc">init</span> 1
kfreqratio <span class="opc">init</span> 1
ktime_unit <span class="opc">expseg</span> iminTime,p3<span class="op">/</span>8,iminTime,p3<span class="op">*</span> 3<span class="op">/</span>4,imaxTime,p3<span class="op">/</span>8,imaxTime
<span class="comment">;**ktrig seqtime ktime_unit, kstart, kloop, initndx, kfn_times </span>
ktrig <span class="opc">seqtime</span> 1<span class="op">/</span>ktime_unit, 0, 15, 0, giTimes
<span class="comment">;ktrig metro ktime_unit</span>
<span class="comment">;**** trigseq ktrig_in, kstart, kloop, initndx, kfn_values, kout1 [, kout2, kout3, ...., koutN] </span>
<span class="opc">trigseq</span> ktrig, 0, kloop2, initndx2, giSeq, kampratio, kfreqratio
<span class="opc">printk2</span> ktrig
<span class="comment">;atrig = ktrig*10000</span>
<span class="comment">; schedkwhen ktrig, -1, -1, 2, 0, kdur, kampratio*iamp, kfreqratio*icps</span>
<span class="opc">schedkwhen</span> ktrig, <span class="op">-</span>1, <span class="op">-</span>1, 3, 0, ktrig, kampratio<span class="op">*</span>iamp, kfreqratio<span class="op">*</span>icps
<span class="oblock">endin</span>
<span class="oblock">instr</span> 3
<span class="opc">print</span> p3
kenv <span class="opc">expseg</span> 1.04, p3,.04
a1 <span class="opc">foscili</span> p4<span class="op">*</span><span class="opc">a</span>(kenv<span class="op">-</span>0.04), p5,1,1,kenv<span class="op">*</span>5, 2
<span class="opc">outs</span> a1, a1
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span>2 0 8192 10 1
<span class="comment">; icps unused unused kloop2 initndx2 kdur iminTime imaxTime</span>
<span class="stamnt">s</span>
<span class="stamnt">i</span>1 0 6 100 0 0 5 0 .2 3 15
<span class="stamnt">i</span>1 8 6 150 0 0 4 1 .1 4 30
<span class="stamnt">i</span>1 16 6 200 0 0 5 3 .25 8 50
<span class="stamnt">i</span>1 24 6 300 0 0 3 0 .1 1 30
<span class="stamnt">i</span>2 32 6 100 0 0 5 0 .2 1 1
<span class="stamnt">i</span>2 40 6 150 0 0 4 1 .1 .5 .5
<span class="stamnt">i</span>2 48 6 200 0 0 5 3 .25 3 .5
<span class="stamnt">i</span>2 56 6 300 0 0 5 0 .1 1 8
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp49552552"></a>
<h2>See Also</h2>
<p>
<a class="link" href="seqtime.html" title="seqtime"><em class="citetitle">seqtime</em></a>,
<a class="link" href="trigger.html" title="trigger"><em class="citetitle">trigger</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp49554048"></a>
<h2>Credits</h2>
<p>Author: Gabriel Maldonado</p>
<p>November 2002. Added a note about the <span class="emphasis"><em>kinitndx</em></span> parameter, thanks to Rasmus Ekman.</p>
<p>January 2003. Thanks to a note from Øyvind Brandtsegg, I corrected the credits.</p>
<p>New in version 4.06</p>
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