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<h2>
<span class="refentrytitle">midion</span>
</h2>
<p>midion —
Generates MIDI note messages at k-rate.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp31306168"></a>
<h2>Description</h2>
<p>
Generates MIDI note messages at k-rate.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp31306816"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>midion</strong></span> kchn, knum, kvel</pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp31317160"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kchn</em></span> -- MIDI channel number (1-16)
</p>
<p>
<span class="emphasis"><em>knum</em></span> -- note number (0-127)
</p>
<p>
<span class="emphasis"><em>kvel</em></span> -- velocity (0-127)
</p>
<p>
<span class="emphasis"><em>midion</em></span> (k-rate note on) plays MIDI notes with current <span class="emphasis"><em>kchn</em></span>, <span class="emphasis"><em>knum</em></span> and <span class="emphasis"><em>kvel</em></span>. These arguments can be varied at k-rate. Each time the MIDI converted value of any of these arguments changes, last MIDI note played by current instance of <span class="emphasis"><em>midion</em></span> is immediately turned off and a new note with the new argument values is activated. This opcode, as well as <span class="emphasis"><em>moscil</em></span>, can generate very complex melodic textures if controlled by complex k-rate signals.
</p>
<p>
Any number of <span class="emphasis"><em>midion</em></span> opcodes can appear in the same Csound instrument, allowing a counterpoint-style polyphony within a single instrument.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp31358408"></a>
<h2>Examples</h2>
<p>
Here is a simple example of the midion opcode. It uses the file <a class="ulink" href="examples/midion_simple.csd" target="_top"><em class="citetitle">midion_simple.csd</em></a>.
</p>
<div class="example">
<a id="idp31359336"></a>
<p class="title">
<strong>Example 467. Simple Example of the midion 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>
<p>This example generates a minor chord over every note received on the MIDI input. It generates MIDI notes on csound's MIDI output, so be sure to connect something.</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>
<span class="comment">; Audio out Audio in No messages</span>
-odac -iadc -d -M0 -Q1 <span class="comment">;;;RT audio I/O with MIDI in</span>
<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> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="comment">; Example by Giorgio Zucco 2007</span>
<span class="oblock">instr</span> 1 <span class="comment">;Triggered by MIDI notes on channel 1</span>
ifund <span class="opc">notnum</span>
ivel <span class="opc">veloc</span>
knote1 <span class="opc">init</span> ifund
knote2 <span class="opc">init</span> ifund <span class="op">+</span> 3
knote3 <span class="opc">init</span> ifund <span class="op">+</span> 5
<span class="comment">;minor chord on MIDI out channel 1</span>
<span class="comment">;Needs something plugged to csound's MIDI output</span>
<span class="opc">midion</span> 1, knote1,ivel
<span class="opc">midion</span> 1, knote2,ivel
<span class="opc">midion</span> 1, knote3,ivel
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Dummy ftable</span>
<span class="stamnt">f</span>0 60
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
Here is another example of the midion opcode. It uses the file <a class="ulink" href="examples/midion_scale.csd" target="_top"><em class="citetitle">midion_scale.csd</em></a>.
</p>
<div class="example">
<a id="idp31362328"></a>
<p class="title">
<strong>Example 468. Example of the midion opcode to generate random notes from a scale.</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>
<p>This example generates random notes from a given scale for every note received on the MIDI input. It generates MIDI notes on csound's MIDI output, so be sure to connect something.</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>
<span class="comment">; Audio out Audio in No messages</span>
-odac -iadc -d -M0 -Q1 <span class="comment">;;;RT audio I/O with MIDI in</span>
<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> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="comment">; Example by Giorgio Zucco 2007</span>
<span class="oblock">instr</span> 1 <span class="comment">; Triggered by MIDI notes on channel 1</span>
ivel <span class="opc">veloc</span>
krate <span class="op">=</span> 8
iscale <span class="op">=</span> 100 <span class="comment">;f</span>
<span class="comment">; Random sequence from table f100</span>
krnd <span class="opc">randh</span> <span class="opc">int</span>(14),krate,<span class="op">-</span>1
knote <span class="opc">table</span> <span class="opc">abs</span>(krnd),iscale
<span class="comment">; Generates random notes from the scale on ftable 100</span>
<span class="comment">; on channel 1 of csound's MIDI output</span>
<span class="opc">midion</span> 1,knote,ivel
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span>100 0 32 -2 40 50 60 70 80 44 54 65 74 84 39 49 69 69
<span class="comment">; Dummy ftable</span>
<span class="stamnt">f</span>0 60
<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="idp31365016"></a>
<h2>See Also</h2>
<p>
<a class="link" href="moscil.html" title="moscil"><em class="citetitle">moscil</em></a>,
<a class="link" href="midion2.html" title="midion2"><em class="citetitle">midion2</em></a>,
<a class="link" href="noteon.html" title="noteon"><em class="citetitle">noteon</em></a>,
<a class="link" href="noteoff.html" title="noteoff"><em class="citetitle">noteoff</em></a>,
<a class="link" href="noteondur.html" title="noteondur"><em class="citetitle">noteondur</em></a>,
<a class="link" href="noteondur2.html" title="noteondur2"><em class="citetitle">noteondur2</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp31368432"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Gabriel Maldonado</td>
</tr>
<tr>
<td>Italy</td>
</tr>
<tr>
<td>May 1997</td>
</tr>
</table>
<p>
</p>
<p>Thanks goes to Rasmus Ekman for pointing out the correct MIDI channel and controller number ranges.</p>
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