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<h2>
<span class="refentrytitle">cpstmid</span>
</h2>
<p>cpstmid —
Get a MIDI note number (allows customized micro-tuning scales).
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp16938712"></a>
<h2>Description</h2>
<p>
This unit is similar to <a class="link" href="cpsmidi.html" title="cpsmidi"><em class="citetitle">cpsmidi</em></a>, but allows fully customized micro-tuning scales.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp16939920"></a>
<h2>Syntax</h2>
<pre class="synopsis">icps <span class="command"><strong>cpstmid</strong></span> ifn</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp16996104"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ifn</em></span> -- function table containing the parameters (<span class="emphasis"><em>numgrades</em></span>, <span class="emphasis"><em>interval</em></span>, <span class="emphasis"><em>basefreq</em></span>, <span class="emphasis"><em>basekeymidi</em></span>) and the tuning ratios.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp16997864"></a>
<h2>Performance</h2>
<p>
Init-rate only
</p>
<p>
<span class="emphasis"><em>cpsmid</em></span> requires five parameters, the first, <span class="emphasis"><em>ifn</em></span>, is the function table number of the tuning ratios, and the other parameters must be stored in the function table itself. The function table <span class="emphasis"><em>ifn</em></span> should be generated by <a class="link" href="GEN02.html" title="GEN02"><em class="citetitle">GEN02</em></a>, with normalization inhibited. The first four values stored in this function are:
</p>
<div class="orderedlist">
<ol class="orderedlist" type="1">
<li class="listitem">
<p><span class="emphasis"><em>numgrades</em></span> -- the number of grades of the micro-tuning scale</p>
</li>
<li class="listitem">
<p><span class="emphasis"><em>interval</em></span> -- the frequency range covered before repeating the grade ratios, for example 2 for one octave, 1.5 for a fifth etc.</p>
</li>
<li class="listitem">
<p><span class="emphasis"><em>basefreq</em></span> -- the base frequency of the scale in Hz</p>
</li>
<li class="listitem">
<p><span class="emphasis"><em>basekeymidi</em></span> -- the MIDI note number to which <span class="emphasis"><em>basefreq</em></span> is assigned unmodified</p>
</li>
</ol>
</div>
<p>
</p>
<p>
After these four values, the user can begin to insert the tuning ratios. For example, for a standard 12 note scale with the base frequency of 261 Hz assigned to the key number 60, the corresponding f-statement in the score to generate the table should be:
</p>
<div class="literallayout">
<p><br />
; numgrades interval basefreq basekeymidi tuning ratios (equal temp) <br />
f1 0 64 -2 12 2 261 60 1 1.059463094359 1.122462048309 1.189207115003 ..etc... <br />
</p>
</div>
<p>
</p>
<p>
Another example with a 24 note scale with a base frequency of 440 assigned to the key number 48, and a repetition interval of 1.5:
</p>
<div class="literallayout">
<p><br />
; numgrades interval basefreq basekeymidi tuning-ratios (equal temp) <br />
f1 0 64 -2 24 1.5 440 48 1 1.01 1.02 1.03 ..etc... <br />
</p>
</div>
<p>
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp17005848"></a>
<h2>Examples</h2>
<p>
Here is an example of the cpstmid opcode. It uses the file <a class="ulink" href="examples/cpstmid.csd" target="_top"><em class="citetitle">cpstmid.csd</em></a>.
</p>
<div class="example">
<a id="idp17006832"></a>
<p class="title">
<strong>Example 136. Example of the cpstmid 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>
<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 -M0 <span class="comment">;;;RT audio I/O with MIDI in</span>
<span class="comment">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o cpstmid.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; after an example from Kevin Conder</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="comment">; Table #1, a normal 12-tone equal temperament scale.</span>
<span class="comment">; numgrades = 12 (twelve tones)</span>
<span class="comment">; interval = 2 (one octave)</span>
<span class="comment">; basefreq = 261.659 (Middle C)</span>
<span class="comment">; basekeymidi = 60 (Middle C)</span>
gitemp <span class="ohdr">ftgen</span> 1, 0, 64, <span class="op">-</span>2, 12, 2, 261.659, 60, 1.00, \
1.059, 1.122, 1.189, 1.260, 1.335, 1.414, \
1.498, 1.588, 1.682, 1.782, 1.888, 2.000
<span class="oblock">instr</span> 1
ifn <span class="op">=</span> 1
icps <span class="opc">cpstmid</span> ifn
<span class="opc">print</span> icps
asig <span class="opc">oscil</span> 0.6, icps, 2
<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 20
<span class="comment">;sine wave.</span>
<span class="stamnt">f</span> 2 0 16384 10 1
<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="idp17009144"></a>
<h2>See Also</h2>
<p>
<a class="link" href="cpsmidi.html" title="cpsmidi"><em class="citetitle">cpsmidi</em></a>,
<a class="link" href="GEN02.html" title="GEN02"><em class="citetitle">GEN02</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp17010680"></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>1998</td>
</tr>
</table>
<p>
</p>
<p>New in Csound version 3.492</p>
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