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<h2>
<span class="refentrytitle">metro</span>
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<p>metro —
Trigger Metronome
</p>
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<div class="refsect1" title="Description">
<a id="idp30680744"></a>
<h2>Description</h2>
<p>
Generate a metronomic signal to be used in any circumstance an isochronous trigger is needed.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp30681544"></a>
<h2>Syntax</h2>
<pre class="synopsis">ktrig <span class="command"><strong>metro</strong></span> kfreq [, initphase]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp30710792"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>initphase</em></span> - initial phase value (in the 0 to 1 range)
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp30711728"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>ktrig</em></span> - output trigger signal
</p>
<p>
<span class="emphasis"><em>kfreq</em></span> - frequency of trigger bangs in cps
</p>
<p>
<span class="emphasis"><em>metro</em></span> 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.
</p>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;">
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</td>
<th align="left">Note</th>
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<td align="left" valign="top">
<p>
<span class="emphasis"><em>metro</em></span> 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.
</p>
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<div class="refsect1" title="Examples">
<a id="idp30714904"></a>
<h2>Examples</h2>
<p>
Here is an example of the metro opcode. It uses the file <a class="ulink" href="examples/metro.csd" target="_top"><em class="citetitle">metro.csd</em></a>
</p>
<div class="example">
<a id="idp30715856"></a>
<p class="title">
<strong>Example 451. Example of the metro opcode.</strong>
</p>
<div class="example-contents">
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
-odac -B441 -b441
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 100
<span class="ohdr">ksmps</span> <span class="op">=</span> 441
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="oblock">instr</span> 1
ktrig <span class="opc">metro</span> 0.2
<span class="opc">printk2</span> ktrig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 20
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
Here is another example of the metro opcode. It uses the file <a class="ulink" href="examples/metro-2.csd" target="_top"><em class="citetitle">metro-2.csd</em></a>
</p>
<div class="example">
<a id="idp30717224"></a>
<p class="title">
<strong>Example 452. Another xample of the metro opcode.</strong>
</p>
<div class="example-contents">
<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 realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o metro-2.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
<span class="oblock">instr</span> 1
kpch <span class="opc">random</span> 1,20 <span class="comment">;produce values at k-rate</span>
ktrig <span class="opc">metro</span> 10 <span class="comment">;trigger 10 times per second</span>
kval <span class="opc">samphold</span> kpch, ktrig <span class="comment">;change value whenever ktrig = 1 </span>
asig <span class="opc">buzz</span> 1, 220, kval, 1<span class="comment">;harmonics</span>
<span class="opc">outs</span> asig, asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span> 1 0 4096 10 1 <span class="comment">; sine</span>
<span class="stamnt">i</span> 1 0 10
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
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<p><br class="example-break" />
</p>
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<div class="refsect1" title="See Also">
<a id="idp30718216"></a>
<h2>See Also</h2>
<p> More information on this opcode in the Floss Manuals: <a class="ulink" href="http://en.flossmanuals.net/csound/ch018_c-control-structures/" target="_top"><em class="citetitle">http://en.flossmanuals.net/csound/ch018_c-control-structures/</em></a></p>
</div>
<div class="refsect1" title="Credits">
<a id="idp30719360"></a>
<h2>Credits</h2>
<p>Written by Gabriel Maldonado.</p>
<p>First Example written by Andrés Cabrera.</p>
<p>New in Csound 5 (Previously available only on CsoundAV)</p>
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