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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">
<a id="idm281472914270056"></a>
<h2>Description</h2>
<p>
Generates MIDI note messages at k-rate.
</p>
</div>
<div class="refsect1">
<a id="idm281472914268808"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>midion</strong></span> kchn, knum, kvel</pre>
</div>
<div class="refsect1">
<a id="idm281472914196088"></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">
<a id="idm281472914188376"></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="idm281472914186584"></a>
<p class="title">
<strong>Example 550. 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>
<div class="refsect1">
<a id="idm281472738346520"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
<span class="c1">; Audio out Audio in No messages</span>
-odac -iadc -d -M0 -Q1 <span class="c1">;;;RT audio I/O with MIDI in</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">kr</span> <span class="o">=</span> <span class="mi">4410</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">10</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="c1">; Example by Giorgio Zucco 2007</span>
<span class="kd">instr</span> <span class="nf">1</span> <span class="c1">;Triggered by MIDI notes on channel 1</span>
i<span class="n">fund</span> <span class="nb">notnum</span>
i<span class="n">vel</span> <span class="nb">veloc</span>
k<span class="n">note1</span> <span class="nb">init</span> i<span class="n">fund</span>
k<span class="n">note2</span> <span class="nb">init</span> i<span class="n">fund</span> <span class="o">+</span> <span class="mi">3</span>
k<span class="n">note3</span> <span class="nb">init</span> i<span class="n">fund</span> <span class="o">+</span> <span class="mi">5</span>
<span class="c1">;minor chord on MIDI out channel 1</span>
<span class="c1">;Needs something plugged to csound's MIDI output</span>
<span class="nb">midion</span> <span class="mi">1</span><span class="p">,</span> k<span class="n">note1</span><span class="p">,</span>i<span class="n">vel</span>
<span class="nb">midion</span> <span class="mi">1</span><span class="p">,</span> k<span class="n">note2</span><span class="p">,</span>i<span class="n">vel</span>
<span class="nb">midion</span> <span class="mi">1</span><span class="p">,</span> k<span class="n">note3</span><span class="p">,</span>i<span class="n">vel</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="c1">; Dummy ftable</span>
<span class="nb">f</span><span class="mi">0</span> <span class="mi">60</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</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="idm281472914181208"></a>
<p class="title">
<strong>Example 551. 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>
<div class="refsect1">
<a id="idm281472738290680"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
<span class="c1">; Audio out Audio in No messages</span>
-odac -iadc -d -M0 -Q1 <span class="c1">;;;RT audio I/O with MIDI in</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">kr</span> <span class="o">=</span> <span class="mi">4410</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">10</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="c1">; Example by Giorgio Zucco 2007</span>
<span class="kd">instr</span> <span class="nf">1</span> <span class="c1">; Triggered by MIDI notes on channel 1</span>
i<span class="n">vel</span> <span class="nb">veloc</span>
k<span class="n">rate</span> <span class="o">=</span> <span class="mi">8</span>
i<span class="n">scale</span> <span class="o">=</span> <span class="mi">100</span> <span class="c1">;f</span>
<span class="c1">; Random sequence from table f100</span>
k<span class="n">rnd</span> <span class="nb">randh</span> <span class="nb">int</span><span class="p">(</span><span class="mi">14</span><span class="p">),</span>k<span class="n">rate</span><span class="p">,</span><span class="o">-</span><span class="mi">1</span>
k<span class="n">note</span> <span class="nb">table</span> <span class="nb">abs</span><span class="p">(</span>k<span class="n">rnd</span><span class="p">),</span>i<span class="n">scale</span>
<span class="c1">; Generates random notes from the scale on ftable 100</span>
<span class="c1">; on channel 1 of csound's MIDI output</span>
<span class="nb">midion</span> <span class="mi">1</span><span class="p">,</span>k<span class="n">note</span><span class="p">,</span>i<span class="n">vel</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">f</span><span class="mi">100</span> <span class="mi">0</span> <span class="mi">32</span> <span class="o">-</span><span class="mi">2</span> <span class="mi">40</span> <span class="mi">50</span> <span class="mi">60</span> <span class="mi">70</span> <span class="mi">80</span> <span class="mi">44</span> <span class="mi">54</span> <span class="mi">65</span> <span class="mi">74</span> <span class="mi">84</span> <span class="mi">39</span> <span class="mi">49</span> <span class="mi">69</span> <span class="mi">69</span>
<span class="c1">; Dummy ftable</span>
<span class="nb">f</span><span class="mi">0</span> <span class="mi">60</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1">
<a id="idm281472914176312"></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">
<a id="idm281472914169464"></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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