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<h2>
<span class="refentrytitle">ctrl21</span>
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<p>ctrl21 —
Allows a floating-point 21-bit MIDI signal scaled with a minimum and a maximum range.
</p>
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<div class="refsect1" title="Description">
<a id="idp17349896"></a>
<h2>Description</h2>
<p>
Allows a floating-point 21-bit MIDI signal scaled with a minimum and a maximum range.
</p>
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<div class="refsect1" title="Syntax">
<a id="idp17350592"></a>
<h2>Syntax</h2>
<pre class="synopsis">idest <span class="command"><strong>ctrl21</strong></span> ichan, ictlno1, ictlno2, ictlno3, imin, imax [, ifn]</pre>
<pre class="synopsis">kdest <span class="command"><strong>ctrl21</strong></span> ichan, ictlno1, ictlno2, ictlno3, kmin, kmax [, ifn]</pre>
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<div class="refsect1" title="Initialization">
<a id="idp17400800"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>idest</em></span> -- output signal
</p>
<p>
<span class="emphasis"><em>ichan</em></span> -- MIDI channel number (1-16)
</p>
<p>
<span class="emphasis"><em>ictlno1</em></span> -- most-significant byte controller number (0-127)
</p>
<p>
<span class="emphasis"><em>ictlno2</em></span> -- mid-significant byte controller number (0-127)
</p>
<p>
<span class="emphasis"><em>ictlno3</em></span> -- least-significant byte controller number (0-127)
</p>
<p>
<span class="emphasis"><em>imin</em></span> -- user-defined minimum floating-point value of output
</p>
<p>
<span class="emphasis"><em>imax</em></span> -- user-defined maximum floating-point value of output
</p>
<p>
<span class="emphasis"><em>ifn</em></span> (optional) -- table to be read when indexing is required. Table must be normalized. Output is scaled according to <span class="emphasis"><em>imax</em></span> and <span class="emphasis"><em>imin</em></span> val.
</p>
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<div class="refsect1" title="Performance">
<a id="idp17405368"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kdest</em></span> -- output signal
</p>
<p>
<span class="emphasis"><em>kmin</em></span> -- user-defined minimum floating-point value of output
</p>
<p>
<span class="emphasis"><em>kmax</em></span> -- user-defined maximum floating-point value of output
</p>
<p>
<span class="emphasis"><em>ctrl21</em></span> (i- and k-rate 21 bit MIDI control) allows a floating-point 21-bit MIDI signal scaled with a minimum and a maximum range. Minimum and maximum values can be varied at k-rate. It can use optional interpolated table indexing. It requires three MIDI controllers as input.
</p>
<p>
<span class="emphasis"><em>ctrl21</em></span> differs from <a class="link" href="midic21.html" title="midic21"><em class="citetitle">midic21</em></a> because it can be included in score oriented instruments without Csound crashes. It needs the additional parameter <span class="emphasis"><em>ichan</em></span> containing the MIDI channel of the controller. MIDI channel is the same for all the controllers used in a single <span class="emphasis"><em>ctrl21</em></span> opcode.
</p>
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<div class="refsect1" title="See Also">
<a id="idp17409400"></a>
<h2>See Also</h2>
<p>
<a class="link" href="ctrl7.html" title="ctrl7"><em class="citetitle">ctrl7</em></a>,
<a class="link" href="ctrl14.html" title="ctrl14"><em class="citetitle">ctrl14</em></a>,
<a class="link" href="initc7.html" title="initc7"><em class="citetitle">initc7</em></a>,
<a class="link" href="initc14.html" title="initc14"><em class="citetitle">initc14</em></a>,
<a class="link" href="initc21.html" title="initc21"><em class="citetitle">initc21</em></a>,
<a class="link" href="midic7.html" title="midic7"><em class="citetitle">midic7</em></a>,
<a class="link" href="midic14.html" title="midic14"><em class="citetitle">midic14</em></a>,
<a class="link" href="midic21.html" title="midic21"><em class="citetitle">midic21</em></a>
</p>
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<div class="refsect1" title="Credits">
<a id="idp17413816"></a>
<h2>Credits</h2>
<p>
</p>
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<tr>
<td>Author: Gabriel Maldonado</td>
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<tr>
<td>Italy</td>
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<p>
</p>
<p>New in Csound version 3.47</p>
<p>Thanks goes to Rasmus Ekman for pointing out the correct MIDI channel and controller number ranges.</p>
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