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<h2>
<span class="refentrytitle">chnclear</span>
</h2>
<p>chnclear —
Clears an audio output channel of the named software bus.
</p>
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<div class="refsect1" title="Description">
<a id="idp15590616"></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>
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<div class="refsect1" title="Syntax">
<a id="idp15675672"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>chnclear</strong></span> Sname</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp15676664"></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" title="Examples">
<a id="idp15677584"></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="idp15678576"></a>
<p class="title">
<strong>Example 102. Example of the chnclear opcode.</strong>
</p>
<div class="example-contents">
<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 <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o chnclear.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">;Example by Joachim Heintz</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="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="oblock">instr</span> 1<span class="comment">; send i-values</span>
<span class="opc">chnset</span> 1, "sio"
<span class="opc">chnset</span> <span class="op">-</span>1, "non"
<span class="oblock">endin</span>
<span class="oblock">instr</span> 2<span class="comment">; send k-values</span>
kfreq <span class="opc">randomi</span> 100, 300, 1
<span class="opc">chnset</span> kfreq, "cntrfreq"
kbw <span class="op">=</span> kfreq<span class="op">/</span>10
<span class="opc">chnset</span> kbw, "bandw"
<span class="oblock">endin</span>
<span class="oblock">instr</span> 3<span class="comment">; send a-values</span>
anois <span class="opc">rand</span> .1
<span class="opc">chnset</span> anois, "noise"
loop<span class="op">:</span>
idur <span class="opc">random</span> .3, 1.5
<span class="octrl">timout</span> 0, idur, do
<span class="opc">reinit</span> loop
do<span class="op">:</span>
ifreq <span class="opc">random</span> 400, 1200
iamp <span class="opc">random</span> .1, .3
asig <span class="opc">oscils</span> iamp, ifreq, 0
aenv <span class="opc">transeg</span> 1, idur, <span class="op">-</span>10, 0
asine <span class="op">=</span> asig <span class="op">*</span> aenv
<span class="opc">chnset</span> asine, "sine"
<span class="oblock">endin</span>
<span class="oblock">instr</span> 11<span class="comment">; receive some chn values and send again</span>
ival1 <span class="opc">chnget</span> "sio"
ival2 <span class="opc">chnget</span> "non"
<span class="opc">print</span> ival1, ival2
kcntfreq <span class="opc">chnget</span> "cntrfreq"
kbandw <span class="opc">chnget</span> "bandw"
anoise <span class="opc">chnget</span> "noise"
afilt <span class="opc">reson</span> anoise, kcntfreq, kbandw
afilt <span class="opc">balance</span> afilt, anoise
<span class="opc">chnset</span> afilt, "filtered"
<span class="oblock">endin</span>
<span class="oblock">instr</span> 12<span class="comment">; mix the two audio signals</span>
amix1 <span class="opc">chnget</span> "sine"
amix2 <span class="opc">chnget</span> "filtered"
<span class="opc">chnmix</span> amix1, "mix"
<span class="opc">chnmix</span> amix2, "mix"
<span class="oblock">endin</span>
<span class="oblock">instr</span> 20<span class="comment">; receive and reverb</span>
amix <span class="opc">chnget</span> "mix"
aL, aR <span class="opc">freeverb</span> amix, amix, .8, .5
<span class="opc">outs</span> aL, aR
<span class="oblock">endin</span>
<span class="oblock">instr</span> 100<span class="comment">; clear</span>
<span class="opc">chnclear</span> "mix"
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 20
<span class="stamnt">i</span> 2 0 20
<span class="stamnt">i</span> 3 0 20
<span class="stamnt">i</span> 11 0 20
<span class="stamnt">i</span> 12 0 20
<span class="stamnt">i</span> 20 0 20
<span class="stamnt">i</span> 100 0 20
<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="Credits">
<a id="idp15679592"></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>
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