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<h2>
<span class="refentrytitle">nchnls</span>
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<p>nchnls —
Sets the number of channels of audio output.
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<div class="refsect1" title="Description">
<a id="idp32609912"></a>
<h2>Description</h2>
<p>
These statements are global value <a class="link" href="assign.html" title="="><em class="citetitle">assignments</em></a>, made at the beginning of an orchestra, before any instrument block is defined. Their function is to set certain <a class="link" href="OrchKvar.html#VariableTypes" title="Table 3. Types of Variables"><em class="citetitle">reserved symbol variables</em></a> that are required for performance. Once set, these reserved symbols can be used in expressions anywhere in the orchestra.
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<div class="refsect1" title="Syntax">
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<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>nchnls</strong></span> = iarg</pre>
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<div class="refsect1" title="Initialization">
<a id="idp32719032"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>nchnls</em></span> = (optional) -- set number of channels of audio output to <span class="emphasis"><em>iarg</em></span>. (1 = mono, 2 = stereo, 4 = quadraphonic.) The default value is 1 (mono).
</p>
<p>
In addition, any <a class="link" href="OrchKvar.html#GlobalVariables"><em class="citetitle">global variable</em></a> can be initialized by an <span class="emphasis"><em>init-time assignment</em></span> anywhere before the first <a class="link" href="instr.html" title="instr"><em class="citetitle">instr statement</em></a>. All of the above assignments are run as instrument 0 (i-pass only) at the start of real performance.
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<div class="refsect1" title="Examples">
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<h2>Examples</h2>
<p>
Here is an example of the nchnls opcode. It uses the file <a class="ulink" href="examples/nchnls.csd" target="_top"><em class="citetitle">nchnls.csd</em></a>.
</p>
<div class="example">
<a id="idp32722760"></a>
<p class="title">
<strong>Example 503. Example of the nchnls 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 -idac <span class="comment">;;;realtime audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; nchnls.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></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="comment">;two channels out</span>
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="oblock">instr</span> 1
ain1, ainr <span class="opc">ins</span> <span class="comment">;grab your mic and sing</span>
adel <span class="opc">linseg</span> 0, p3<span class="op">*</span>.5, 0.02, p3<span class="op">*</span>.5, 0 <span class="comment">;max delay time = 20ms</span>
aoutl <span class="opc">flanger</span> ain1, adel, .7
aoutr <span class="opc">flanger</span> ain1, adel<span class="op">*</span>2, .8
<span class="opc">fout</span> "in_s.wav", 14, aoutl, aoutr <span class="comment">;write to stereo file,</span>
<span class="opc">outs</span> aoutl, aoutr <span class="comment">;16 bits with header</span>
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 10
<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="idp32725032"></a>
<h2>See Also</h2>
<p>
<a class="link" href="kr.html" title="kr"><em class="citetitle">kr</em></a>,
<a class="link" href="ksmps.html" title="ksmps"><em class="citetitle">ksmps</em></a>,
<a class="link" href="sr.html" title="sr"><em class="citetitle">sr</em></a>
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