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<div class="refentry" title="midicontrolchange">
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<h2>
<span class="refentrytitle">midicontrolchange</span>
</h2>
<p>midicontrolchange —
Gets a MIDI control change value.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp30911056"></a>
<h2>Description</h2>
<p>
<span class="emphasis"><em>midicontrolchange</em></span> is designed to simplify writing instruments that can be used interchangeably for either score or MIDI input, and to make it easier to adapt instruments originally written for score input to work with MIDI input.
</p>
<p>
In general, it should be possible to write instrument definitions that work identically with both scores
and MIDI, including both MIDI files and real-time MIDI input, without using any conditional statements, and that take full advantage of MIDI voice messages.
</p>
<p>
Note that correlating Csound instruments with MIDI channel numbers is done using the <a class="link" href="massign.html" title="massign"><em class="citetitle">massign</em></a> opcode for real-time performance,. For file-driven performance, instrument numbers default to MIDI channel number + 1, but the defaults are overridden by any MIDI program change messages in the file.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp30923032"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>midicontrolchange</strong></span> xcontroller, xcontrollervalue [, ilow] [, ihigh]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp30924112"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ilow</em></span> (optional) -- optional low value after rescaling, defaults to 0.
</p>
<p>
<span class="emphasis"><em>ihigh</em></span> (optional) -- optional high value after rescaling, defaults to 127.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp30925480"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>xcontroller</em></span> -- specifies a MIDI controller number (0-127).
</p>
<p>
<span class="emphasis"><em>xcontrollervalue</em></span> -- returns the value of the MIDI controller during MIDI activation, remains unchanged otherwise.
</p>
<p>
If the instrument was activated by MIDI input, the opcode overwrites the values of the <span class="emphasis"><em>xcontroller</em></span> and <span class="emphasis"><em>xcontrollervalue</em></span> with the corresponding values from MIDI input. If the instrument was <span class="emphasis"><em>NOT</em></span> activated by MIDI input, the values of <span class="emphasis"><em>xcontroller</em></span> and <span class="emphasis"><em>xcontrollervalue</em></span> remain unchanged.
</p>
<p>
This enables score p-fields to receive MIDI input data during MIDI activation, and score values otherwise.
</p>
<div class="note" title="Adapting a score-activated Csound instrument." style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Note: Adapting a score-activated Csound instrument.">
<tr>
<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Note]" src="images/note.png" />
</td>
<th align="left">Adapting a score-activated Csound instrument.</th>
</tr>
<tr>
<td align="left" valign="top">
<p>See the <a class="link" href="MidiInterop.html" title="MIDI/Score Interoperability opcodes"><em class="citetitle">MIDI interop opcodes</em></a> section for details on adapting score driven instruments for MIDI or vice-versa.</p>
</td>
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</div>
</div>
<div class="refsect1" title="Examples">
<a id="idp30966232"></a>
<h2>Examples</h2>
<p>
Here is an example of the midicontrolchange opcode. It uses the file <a class="ulink" href="examples/midicontrolchange.csd" target="_top"><em class="citetitle">midicontrolchange.csd</em></a>
</p>
<div class="example">
<a id="idp30967216"></a>
<p class="title">
<strong>Example 457. Example of the midicontrolchange 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 -+rtmidi=virtual -M0 <span class="comment">;;;realtime audio out and midi in </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 midicontrolchange.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
<span class="comment">; use slider of contr. 7 of virtual keyboard</span>
kcont <span class="opc">init</span> 1 <span class="comment">; max. volume</span>
<span class="opc">midicontrolchange</span> 7, kcont, 0, 1<span class="comment">; use controller 7, scaled between 0 and 1 </span>
<span class="opc">printk2</span> kcont <span class="comment">; Display the key value when it changes and key is pressed</span>
kenv <span class="opc">madsr</span> 0.5, 0.8, 0.8, 0.5 <span class="comment">; envelope multiplied by</span>
asig <span class="opc">pluck</span> kenv<span class="op">*</span>kcont, 220, 220, 2, 1 <span class="comment">; value of controller 7 </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> 0 30
<span class="stamnt">f</span> 2 0 4096 10 1
<span class="stamnt">i</span> 1 10 2 <span class="comment">; play a note from score as well</span>
<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="idp30968248"></a>
<h2>See Also</h2>
<p>
<a class="link" href="midichannelaftertouch.html" title="midichannelaftertouch"><em class="citetitle">midichannelaftertouch</em></a>,
<a class="link" href="mididefault.html" title="mididefault"><em class="citetitle">mididefault</em></a>,
<a class="link" href="midinoteoff.html" title="midinoteoff"><em class="citetitle">midinoteoff</em></a>,
<a class="link" href="midinoteoncps.html" title="midinoteoncps"><em class="citetitle">midinoteoncps</em></a>,
<a class="link" href="midinoteonkey.html" title="midinoteonkey"><em class="citetitle">midinoteonkey</em></a>,
<a class="link" href="midinoteonoct.html" title="midinoteonoct"><em class="citetitle">midinoteonoct</em></a>,
<a class="link" href="midinoteonpch.html" title="midinoteonpch"><em class="citetitle">midinoteonpch</em></a>,
<a class="link" href="midipitchbend.html" title="midipitchbend"><em class="citetitle">midipitchbend</em></a>,
<a class="link" href="midipolyaftertouch.html" title="midipolyaftertouch"><em class="citetitle">midipolyaftertouch</em></a>,
<a class="link" href="midiprogramchange.html" title="midiprogramchange"><em class="citetitle">midiprogramchange</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp30973800"></a>
<h2>Credits</h2>
<p>Author: Michael Gogins</p>
<p>New in version 4.20</p>
<p>Thanks goes to Rasmus Ekman for pointing out the correct MIDI channel and controller number ranges.</p>
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