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<p>turnoff —
Enables an instrument to turn itself off.
</p>
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<div class="refsect1" title="Description">
<a id="idp49722480"></a>
<h2>Description</h2>
<p>
Enables an instrument to turn itself off.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp49750824"></a>
<h2>Syntax</h2>
<pre class="synopsis">
<span class="command">
<strong>turnoff</strong>
</span>
</pre>
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<div class="refsect1" title="Performance">
<a id="idp49751704"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>turnoff</em></span> -- this p-time statement enables an instrument to turn itself off. Whether of finite duration or <span class="quote">“<span class="quote">held</span>”</span>, the note currently being performed by this instrument is immediately removed from the active note list. No other notes are affected.
</p>
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<th align="left">Note</th>
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<p>
As a rule of thumb, you should turn off instruments with a higher instrument number than the one where turnoff is called, as doing otherwise might cause initialization issues.
</p>
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<div class="refsect1" title="Examples">
<a id="idp49753728"></a>
<h2>Examples</h2>
<p>
The following example uses the turnoff opcode. It will cause a note to terminate when a control signal passes a certain threshold (here the Nyquist frequency). It uses the file <a class="ulink" href="examples/turnoff.csd" target="_top"><em class="citetitle">turnoff.csd</em></a>.
</p>
<div class="example">
<a id="idp49754832"></a>
<p class="title">
<strong>Example 906. Example of the turnoff 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>
<span class="comment">; Audio out Audio in</span>
-odac -iadc <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o turnoff.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Instrument #1.</span>
<span class="oblock">instr</span> 1
k1 <span class="opc">expon</span> 440, p3<span class="op">/</span>10,880 <span class="comment">; begin gliss and continue</span>
<span class="octrl">if</span> k1 <span class="op"><</span> <span class="ohdr">sr</span><span class="op">/</span>2 <span class="octrl">kgoto</span> <span class="olabel">contin</span> <span class="comment">; until Nyquist detected</span>
<span class="opc">turnoff</span> <span class="comment">; then quit</span>
<span class="olabel">contin</span><span class="op">:</span>
a1 <span class="opc">oscil</span> 10000, k1, 1
<span class="opc">out</span> a1
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Table #1: an ordinary sine wave.</span>
<span class="stamnt">f</span> 1 0 32768 10 1
<span class="comment">; Play Instrument #1 for 4 seconds.</span>
<span class="stamnt">i</span> 1 0 4
<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" />
</p>
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<div class="refsect1" title="See Also">
<a id="idp49757144"></a>
<h2>See Also</h2>
<p>
<a class="link" href="ihold.html" title="ihold"><em class="citetitle">ihold</em></a>,
<a class="link" href="turnoff2.html" title="turnoff2"><em class="citetitle">turnoff2</em></a>,
<a class="link" href="turnon.html" title="turnon"><em class="citetitle">turnon</em></a>
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