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<h2>
<span class="refentrytitle">turnoff</span>
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<p>turnoff —
Enables an instrument to turn itself off or to turn an instance of another instrument off.
</p>
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<div class="refsect1">
<a id="idm281472877187992"></a>
<h2>Description</h2>
<p>
Enables an instrument to turn itself off or to turn an instance of another instrument off.
</p>
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<div class="refsect1">
<a id="idm281472877126408"></a>
<h2>Syntax</h2>
<pre class="synopsis">
<span class="command">
<strong>turnoff</strong>
</span>
</pre>
<pre class="synopsis"><span class="command"><strong>turnoff</strong></span> inst</pre>
<pre class="synopsis"><span class="command"><strong>turnoff</strong></span> knst</pre>
</div>
<div class="refsect1">
<a id="idm281472877122136"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>inst</em></span> -- when used with an i-time parameter, this is the instance handle of an instrument to be
turned off (obtained from the nstance opcode).
</p>
<p>
<span class="emphasis"><em>turnoff</em></span> -- with no parameters 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>
<p>
<span class="emphasis"><em>kinst</em></span> -- when used with an k-time parameter, this is the instance handle of an instrument to be turned off (obtained from the nstance opcode).
</p>
</div>
<div class="refsect1">
<a id="idm281472877117032"></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="idm281472877115048"></a>
<p class="title">
<strong>Example 1033. 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>
<div class="refsect1">
<a id="idm281472699636744"></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>
<span class="c1">; Audio out Audio in</span>
-odac -iadc <span class="c1">;;;RT audio I/O</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o turnoff.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="c1">; Initialize the global variables.</span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">kr</span> <span class="o">=</span> <span class="mi">4410</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">10</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">1</span>
<span class="c1">; Instrument #1.</span>
<span class="kd">instr</span> <span class="nf">1</span>
k<span class="n">1</span> <span class="nb">expon</span> <span class="mi">440</span><span class="p">,</span> <span class="nb">p3</span><span class="o">/</span><span class="mi">10</span><span class="p">,</span><span class="mi">880</span> <span class="c1">; begin gliss and continue</span>
<span class="k">if</span> k<span class="n">1</span> <span class="o"><</span> <span class="vg">sr</span><span class="o">/</span><span class="mi">2</span> <span class="k">kgoto</span> <span class="nl">contin</span> <span class="c1">; until Nyquist detected</span>
<span class="nb">turnoff</span> <span class="c1">; then quit</span>
<span class="nl">contin</span><span class="p">:</span>
a<span class="n">1</span> <span class="nb">oscil</span> <span class="mi">10000</span><span class="p">,</span> k<span class="n">1</span><span class="p">,</span> <span class="mi">1</span>
<span class="nb">out</span> a<span class="n">1</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="c1">; Table #1: an ordinary sine wave.</span>
<span class="nb">f</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">32768</span> <span class="mi">10</span> <span class="mi">1</span>
<span class="c1">; Play Instrument #1 for 4 seconds.</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">4</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
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<p><br class="example-break" />
</p>
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<div class="refsect1">
<a id="idm281472877110824"></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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