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<h2>
<span class="refentrytitle">nchnls_i</span>
</h2>
<p>nchnls_i —
Sets the number of channels of audio input.
</p>
</div>
<div class="refsect1">
<a id="idm281472911281528"></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.
</p>
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<div class="refsect1">
<a id="idm281472911259640"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>nchnls_i</strong></span> = iarg</pre>
</div>
<div class="refsect1">
<a id="idm281472911227592"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>nchnls_i</em></span> = (optional) -- set number of channels of
audio input to <span class="emphasis"><em>iarg</em></span>. (1 = mono, 2 = stereo, 4 =
quadraphonic.) The default value is the valus of <span class="emphasis"><em>nchnls</em></span>.
</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.
</p>
</div>
<div class="refsect1">
<a id="idm281472911222392"></a>
<h2>Examples</h2>
<p>
Here is an example of the nchnls_i opcode. It uses the file <a class="ulink" href="examples/nchnls_i.csd" target="_top"><em class="citetitle">nchnls_i.csd</em></a>.
</p>
<div class="example">
<a id="idm281472911220536"></a>
<p class="title">
<strong>Example 595. Example of the nchnls_i 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="idm281472734686472"></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 -idac <span class="c1">;;;realtime audio I/O</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; nchnls_i.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></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="c1">;2 channels out</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="vg">nchnls_i</span> <span class="o">=</span> <span class="mi">4</span> <span class="c1">;4 channels in</span>
<span class="kd">instr</span> <span class="nf">1</span> <span class="c1">;4 channels in, two channels out</span>
a<span class="n">in1</span><span class="p">,</span> a<span class="n">in2</span><span class="p">,</span> a<span class="n">in3</span><span class="p">,</span> a<span class="n">in4</span> <span class="nb">inq</span> <span class="c1">;grab your mics and sing</span>
a<span class="n">del</span> <span class="nb">linseg</span> <span class="mi">0</span><span class="p">,</span> <span class="nb">p3</span><span class="o">*</span><span class="mf">.5</span><span class="p">,</span> <span class="mf">0.02</span><span class="p">,</span> <span class="nb">p3</span><span class="o">*</span><span class="mf">.5</span><span class="p">,</span> <span class="mi">0</span> <span class="c1">;max delay time = 20ms</span>
a<span class="n">del2</span> <span class="nb">linseg</span> <span class="mf">0.02</span><span class="p">,</span> <span class="nb">p3</span><span class="o">*</span><span class="mf">.5</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="nb">p3</span><span class="o">*</span><span class="mf">.5</span><span class="p">,</span> <span class="mf">0.02</span> <span class="c1">;max delay time = 20ms </span>
a<span class="n">outl</span> <span class="nb">flanger</span> a<span class="n">in1</span><span class="p">,</span> a<span class="n">del</span><span class="p">,</span> <span class="mf">.7</span>
a<span class="n">outr</span> <span class="nb">flanger</span> a<span class="n">in2</span><span class="p">,</span> a<span class="n">del</span><span class="o">*</span><span class="mi">2</span><span class="p">,</span> <span class="mf">.8</span>
a<span class="n">outla</span> <span class="nb">flanger</span> a<span class="n">in3</span><span class="p">,</span> a<span class="n">del2</span><span class="p">,</span> <span class="mf">.9</span>
a<span class="n">outra</span> <span class="nb">flanger</span> a<span class="n">in4</span><span class="p">,</span> a<span class="n">del2</span><span class="o">*</span><span class="mi">2</span><span class="p">,</span> <span class="mf">.5</span>
<span class="c1">;write to quad file, 16 bits with header</span>
<span class="nb">fout</span> <span class="s">"in_4.wav"</span><span class="p">,</span> <span class="mi">14</span><span class="p">,</span> a<span class="n">outl</span><span class="p">,</span> a<span class="n">outr</span><span class="p">,</span> a<span class="n">outla</span><span class="p">,</span> a<span class="n">outra</span>
<span class="nb">outs</span> <span class="p">(</span>a<span class="n">outl</span><span class="o">+</span>a<span class="n">outla</span><span class="p">)</span><span class="o">*</span><span class="mf">.5</span><span class="p">,</span> <span class="p">(</span>a<span class="n">outr</span><span class="o">+</span>a<span class="n">outra</span><span class="p">)</span><span class="o">*</span><span class="mf">.5</span> <span class="c1">;stereo out</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">10</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="idm281472911216248"></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="nchnls.html" title="nchnls"><em class="citetitle">nchnls</em></a>,
<a class="link" href="sr.html" title="sr"><em class="citetitle">sr</em></a>
</p>
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