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<h2>
<span class="refentrytitle">chnclear</span>
</h2>
<p>chnclear —
Clears an audio output channel of the named software bus.
</p>
</div>
<div class="refsect1">
<a id="idm281472947145320"></a>
<h2>Description</h2>
<p>
Clears an audio channel of the named software bus to zero.
Implies declaring the channel with <span class="emphasis"><em>imode</em></span>=2 (see also
<a class="link" href="chn.html" title="chn"><em class="citetitle">chn_a</em></a>).
</p>
</div>
<div class="refsect1">
<a id="idm281472947100232"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>chnclear</strong></span> Sname</pre>
</div>
<div class="refsect1">
<a id="idm281472947098184"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>Sname</em></span> -- a string that indicates which
named channel of the software bus to clear.
</p>
</div>
<div class="refsect1">
<a id="idm281472947096440"></a>
<h2>Examples</h2>
<p>
Here is an example of the chnclear opcode. It uses the file <a class="ulink" href="examples/chnclear.csd" target="_top"><em class="citetitle">chnclear.csd</em></a>.
</p>
<div class="example">
<a id="idm281472947094584"></a>
<p class="title">
<strong>Example 122. Example of the chnclear opcode.</strong>
</p>
<div class="example-contents">
<div class="refsect1">
<a id="idm281472781014520"></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 <span class="c1">;;;realtime audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o chnclear.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="c1">;Example by Joachim Heintz</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="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span><span class="c1">; send i-values</span>
<span class="nb">chnset</span> <span class="mi">1</span><span class="p">,</span> <span class="s">"sio"</span>
<span class="nb">chnset</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="s">"non"</span>
<span class="kd">endin</span>
<span class="kd">instr</span> <span class="nf">2</span><span class="c1">; send k-values</span>
k<span class="n">freq</span> <span class="nb">randomi</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">300</span><span class="p">,</span> <span class="mi">1</span>
<span class="nb">chnset</span> k<span class="n">freq</span><span class="p">,</span> <span class="s">"cntrfreq"</span>
k<span class="n">bw</span> <span class="o">=</span> k<span class="n">freq</span><span class="o">/</span><span class="mi">10</span>
<span class="nb">chnset</span> k<span class="n">bw</span><span class="p">,</span> <span class="s">"bandw"</span>
<span class="kd">endin</span>
<span class="kd">instr</span> <span class="nf">3</span><span class="c1">; send a-values</span>
a<span class="n">nois</span> <span class="nb">rand</span> <span class="mf">.1</span>
<span class="nb">chnset</span> a<span class="n">nois</span><span class="p">,</span> <span class="s">"noise"</span>
<span class="nl">loop</span><span class="p">:</span>
i<span class="n">dur</span> <span class="nb">random</span> <span class="mf">.3</span><span class="p">,</span> <span class="mf">1.5</span>
<span class="k">timout</span> <span class="mi">0</span><span class="p">,</span> i<span class="n">dur</span><span class="p">,</span> <span class="k">do</span>
<span class="nb">reinit</span> <span class="n">loop</span>
<span class="nl">do</span><span class="p">:</span>
i<span class="n">freq</span> <span class="nb">random</span> <span class="mi">400</span><span class="p">,</span> <span class="mi">1200</span>
i<span class="n">amp</span> <span class="nb">random</span> <span class="mf">.1</span><span class="p">,</span> <span class="mf">.3</span>
a<span class="n">sig</span> <span class="nb">oscils</span> i<span class="n">amp</span><span class="p">,</span> i<span class="n">freq</span><span class="p">,</span> <span class="mi">0</span>
a<span class="n">env</span> <span class="nb">transeg</span> <span class="mi">1</span><span class="p">,</span> i<span class="n">dur</span><span class="p">,</span> <span class="o">-</span><span class="mi">10</span><span class="p">,</span> <span class="mi">0</span>
a<span class="n">sine</span> <span class="o">=</span> a<span class="n">sig</span> <span class="o">*</span> a<span class="n">env</span>
<span class="nb">chnset</span> a<span class="n">sine</span><span class="p">,</span> <span class="s">"sine"</span>
<span class="kd">endin</span>
<span class="kd">instr</span> <span class="nf">11</span><span class="c1">; receive some chn values and send again</span>
i<span class="n">val1</span> <span class="nb">chnget</span> <span class="s">"sio"</span>
i<span class="n">val2</span> <span class="nb">chnget</span> <span class="s">"non"</span>
<span class="nb">print</span> i<span class="n">val1</span><span class="p">,</span> i<span class="n">val2</span>
k<span class="n">cntfreq</span> <span class="nb">chnget</span> <span class="s">"cntrfreq"</span>
k<span class="n">bandw</span> <span class="nb">chnget</span> <span class="s">"bandw"</span>
a<span class="n">noise</span> <span class="nb">chnget</span> <span class="s">"noise"</span>
a<span class="n">filt</span> <span class="nb">reson</span> a<span class="n">noise</span><span class="p">,</span> k<span class="n">cntfreq</span><span class="p">,</span> k<span class="n">bandw</span>
a<span class="n">filt</span> <span class="nb">balance</span> a<span class="n">filt</span><span class="p">,</span> a<span class="n">noise</span>
<span class="nb">chnset</span> a<span class="n">filt</span><span class="p">,</span> <span class="s">"filtered"</span>
<span class="kd">endin</span>
<span class="kd">instr</span> <span class="nf">12</span><span class="c1">; mix the two audio signals</span>
a<span class="n">mix1</span> <span class="nb">chnget</span> <span class="s">"sine"</span>
a<span class="n">mix2</span> <span class="nb">chnget</span> <span class="s">"filtered"</span>
<span class="nb">chnmix</span> a<span class="n">mix1</span><span class="p">,</span> <span class="s">"mix"</span>
<span class="nb">chnmix</span> a<span class="n">mix2</span><span class="p">,</span> <span class="s">"mix"</span>
<span class="kd">endin</span>
<span class="kd">instr</span> <span class="nf">20</span><span class="c1">; receive and reverb</span>
a<span class="n">mix</span> <span class="nb">chnget</span> <span class="s">"mix"</span>
a<span class="n">L</span><span class="p">,</span> a<span class="n">R</span> <span class="nb">freeverb</span> a<span class="n">mix</span><span class="p">,</span> a<span class="n">mix</span><span class="p">,</span> <span class="mf">.8</span><span class="p">,</span> <span class="mf">.5</span>
<span class="nb">outs</span> a<span class="n">L</span><span class="p">,</span> a<span class="n">R</span>
<span class="kd">endin</span>
<span class="kd">instr</span> <span class="nf">100</span><span class="c1">; clear</span>
<span class="nb">chnclear</span> <span class="s">"mix"</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">20</span>
<span class="nb">i</span> <span class="mi">2</span> <span class="mi">0</span> <span class="mi">20</span>
<span class="nb">i</span> <span class="mi">3</span> <span class="mi">0</span> <span class="mi">20</span>
<span class="nb">i</span> <span class="mi">11</span> <span class="mi">0</span> <span class="mi">20</span>
<span class="nb">i</span> <span class="mi">12</span> <span class="mi">0</span> <span class="mi">20</span>
<span class="nb">i</span> <span class="mi">20</span> <span class="mi">0</span> <span class="mi">20</span>
<span class="nb">i</span> <span class="mi">100</span> <span class="mi">0</span> <span class="mi">20</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1">
<a id="idm281472947092760"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Istvan Varga</td>
</tr>
<tr>
<td>2006</td>
</tr>
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