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<h2>
<span class="refentrytitle">a</span>
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<p>a —
Converts a k-rate parameter to an a-rate value with interpolation.
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<div class="refsect1" title="Description">
<a id="idp13081624"></a>
<h2>Description</h2>
<p>
Converts a k-rate parameter to an a-rate value with interpolation.
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<div class="refsect1" title="Syntax">
<a id="idp13082400"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>a</strong></span>(x) (control-rate args only)</pre>
<p>
where the argument within the parentheses may be an expression. Value converters perform arithmetic translation from units of one kind to units of another. The result can then be a term in a further expression.
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<div class="refsect1" title="Examples">
<a id="idp13086288"></a>
<h2>Examples</h2>
<p>
Here is an example of the a opcode. It uses the file <a class="ulink" href="examples/opa.csd" target="_top"><em class="citetitle">opa.csd</em></a>.
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<div class="example">
<a id="idp13087264"></a>
<p class="title">
<strong>Example 34. Example of the a 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 <span class="comment">;;;RT audio out</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 a.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; hear the difference between instr.1 and 2</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">;sine wave at k-rate</span>
ksig <span class="opc">oscil</span> 0.8, 440, 1
<span class="comment">; k-rate to the audio-rate conversion</span>
asig <span class="op">=</span> <span class="opc">a</span>(ksig)
<span class="opc">outs</span> asig, asig
<span class="oblock">endin</span>
<span class="oblock">instr</span> 2 <span class="comment">;sine wave at a-rate</span>
asig <span class="opc">oscil</span> 0.8, 440, 1
<span class="opc">outs</span> asig, asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; sine wave.</span>
<span class="stamnt">f</span> 1 0 16384 10 1
<span class="stamnt">i</span> 1 0 2
<span class="stamnt">i</span> 2 2 2
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
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<p><br class="example-break" />
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<div class="refsect1" title="See Also">
<a id="idp13089480"></a>
<h2>See Also</h2>
<p>
<a class="link" href="opi.html" title="i"><em class="citetitle">i</em></a>,
<a class="link" href="opk.html" title="k"><em class="citetitle">k</em></a>
</p>
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<div class="refsect1" title="Credits">
<a id="idp13212304"></a>
<h2>Credits</h2>
<p>Author: Gabriel Maldonado</p>
<p>New in version 4.21</p>
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