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<h2>
<span class="refentrytitle">ctrl7</span>
</h2>
<p>ctrl7 —
Allows a floating-point 7-bit MIDI signal scaled with a minimum and a maximum range.
</p>
</div>
<div class="refsect1">
<a id="idm281472943541736"></a>
<h2>Description</h2>
<p>
Allows a floating-point 7-bit MIDI signal scaled with a minimum and a maximum range.
</p>
</div>
<div class="refsect1">
<a id="idm281472943498408"></a>
<h2>Syntax</h2>
<pre class="synopsis">idest <span class="command"><strong>ctrl7</strong></span> ichan, ictlno, imin, imax [, ifn]</pre>
<pre class="synopsis">kdest <span class="command"><strong>ctrl7</strong></span> ichan, ictlno, kmin, kmax [, ifn]</pre>
<pre class="synopsis">adest <span class="command"><strong>ctrl7</strong></span> ichan, ictlno, kmin, kmax [, ifn] [, icutoff]</pre>
</div>
<div class="refsect1">
<a id="idm281472943493320"></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 (1-16)
</p>
<p>
<span class="emphasis"><em>ictlno</em></span> -- MIDI 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>
<p>
<span class="emphasis"><em>icutoff</em></span> (optional) -- low pass filter cut-off frequency for smoothing a-rate output.
</p>
</div>
<div class="refsect1">
<a id="idm281472943485720"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kdest, adest</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>ctrl7</em></span> (i- and k-rate 7 bit MIDI control) allows a floating-point 7-bit MIDI signal scaled with a minimum and a maximum range. It also allows optional non-interpolated table indexing. Minimum and maximum values can be varied at k-rate.
</p>
<p>
<span class="emphasis"><em>ctrl7</em></span> differs from <a class="link" href="midic7.html" title="midic7"><em class="citetitle">midic7</em></a> because it can be included in score-oriented instruments without Csound crashes. It also needs the additional parameter <span class="emphasis"><em>ichan</em></span> containing the MIDI channel of the controller.
</p>
<p>
The a-rate version of <span class="emphasis"><em>ctrl7</em></span> outputs an a-rate variable, which is low-pass filtered (smoothed). It contains an optional <span class="emphasis"><em>icutoff</em></span> parameter, to set the cutoff frecuency for the low-pass filter. The default is 5.
</p>
</div>
<div class="refsect1">
<a id="idm281472943477416"></a>
<h2>Examples</h2>
<p>
Here is an example of the ctrl7 opcode. It uses the file <a class="ulink" href="examples/ctrl7.csd" target="_top"><em class="citetitle">ctrl7.csd</em></a>.
</p>
<div class="example">
<a id="idm281472943475560"></a>
<p class="title">
<strong>Example 177. Example of the ctrl7 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>
<div class="refsect1">
<a id="idm281472776456456"></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>
-odac -M0 <span class="c1">;;;RT audio I/O with MIDI in</span>
<span class="c1">;-iadc ;;;uncomment -iadc if RT audio input is needed too</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">ksmps</span> <span class="o">=</span> <span class="mi">32</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span> <span class="c1">; expects MIDI controller input on channel 1</span>
<span class="c1">; run and move your midi controller to see result</span>
i<span class="n">max</span> <span class="o">=</span> <span class="mi">1</span>
i<span class="n">min</span> <span class="o">=</span> <span class="mi">0</span>
i<span class="n">chan</span> <span class="o">=</span> <span class="mi">1</span>
i<span class="n">ctlno</span> <span class="o">=</span> <span class="mi">7</span>
<span class="nb">initc7</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">7</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">; start at max. volume</span>
k<span class="n">amp</span> <span class="nb">ctrl7</span> i<span class="n">chan</span><span class="p">,</span> i<span class="n">ctlno</span><span class="p">,</span> i<span class="n">min</span><span class="p">,</span> i<span class="n">max</span> <span class="c1">; controller 7</span>
<span class="nb">printk2</span> k<span class="n">amp</span>
a<span class="n">sig</span> <span class="nb">oscil</span> k<span class="n">amp</span><span class="p">,</span> <span class="mi">220</span><span class="p">,</span> <span class="mi">1</span>
<span class="nb">outs</span> a<span class="n">sig</span><span class="p">,</span> a<span class="n">sig</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">f</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">4096</span> <span class="mi">10</span> <span class="mi">1</span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">20</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Note">
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<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Note]" src="images/note.png" />
</td>
<th align="left">Note</th>
</tr>
<tr>
<td align="left" valign="top">
ctrl7 only outputs k values once the controller is first moved. To
set an initial k-value, a call to initc7 is required. Ctrlinit does not work
for this purpose.
</td>
</tr>
</table>
</div>
<div class="refsect1">
<a id="idm281472943470696"></a>
<h2>See Also</h2>
<p>
<a class="link" href="ctrl14.html" title="ctrl14"><em class="citetitle">ctrl14</em></a>,
<a class="link" href="ctrl21.html" title="ctrl21"><em class="citetitle">ctrl21</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>
</div>
<div class="refsect1">
<a id="idm281472943461928"></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>
</table>
<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>
<p>The a-rate version of <span class="emphasis"><em>ctrl7</em></span> was added in version 5.06</p>
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