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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">
<a id="idm281472944401832"></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">
<a id="idm281472944357192"></a>
<h2>Syntax</h2>
<pre class="synopsis">icps <span class="command"><strong>cpstmid</strong></span> ifn</pre>
</div>
<div class="refsect1">
<a id="idm281472944354952"></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">
<a id="idm281472944351544"></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">
<a id="idm281472944337896"></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="idm281472944336120"></a>
<p class="title">
<strong>Example 164. 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>
<div class="refsect1">
<a id="idm281472777416968"></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="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o cpstmid.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="c1">; after an example from Kevin Conder</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="c1">; Table #1, a normal 12-tone equal temperament scale.</span>
<span class="c1">; numgrades = 12 (twelve tones)</span>
<span class="c1">; interval = 2 (one octave)</span>
<span class="c1">; basefreq = 261.659 (Middle C)</span>
<span class="c1">; basekeymidi = 60 (Middle C)</span>
gi<span class="n">temp</span> <span class="nb">ftgen</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">64</span><span class="p">,</span> <span class="o">-</span><span class="mi">2</span><span class="p">,</span> <span class="mi">12</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mf">261.659</span><span class="p">,</span> <span class="mi">60</span><span class="p">,</span> <span class="mf">1.00</span><span class="p">,</span> \
<span class="mf">1.059</span><span class="p">,</span> <span class="mf">1.122</span><span class="p">,</span> <span class="mf">1.189</span><span class="p">,</span> <span class="mf">1.260</span><span class="p">,</span> <span class="mf">1.335</span><span class="p">,</span> <span class="mf">1.414</span><span class="p">,</span> \
<span class="mf">1.498</span><span class="p">,</span> <span class="mf">1.588</span><span class="p">,</span> <span class="mf">1.682</span><span class="p">,</span> <span class="mf">1.782</span><span class="p">,</span> <span class="mf">1.888</span><span class="p">,</span> <span class="mf">2.000</span>
<span class="kd">instr</span> <span class="nf">1</span>
i<span class="n">fn</span> <span class="o">=</span> <span class="mi">1</span>
i<span class="n">cps</span> <span class="nb">cpstmid</span> i<span class="n">fn</span>
<span class="nb">print</span> i<span class="n">cps</span>
a<span class="n">sig</span> <span class="nb">oscil</span> <span class="mf">0.6</span><span class="p">,</span> i<span class="n">cps</span><span class="p">,</span> <span class="mi">2</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">0</span> <span class="mi">20</span>
<span class="c1">;sine wave.</span>
<span class="nb">f</span> <span class="mi">2</span> <span class="mi">0</span> <span class="mi">16384</span> <span class="mi">10</span> <span class="mi">1</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="refsect1">
<a id="idm281472944331896"></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">
<a id="idm281472944328824"></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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