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<div class="refentry" title="outch">
<a id="outch"></a>
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<a id="IndexOutch" class="indexterm"></a>
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<h2>
<span class="refentrytitle">outch</span>
</h2>
<p>outch —
Writes multi-channel audio data, with user-controllable channels, to an external device or stream.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp34102912"></a>
<h2>Description</h2>
<p>
Writes multi-channel audio data, with user-controllable channels, to an external device or stream.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp34103624"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>outch</strong></span> kchan1, asig1 [, kchan2] [, asig2] [...]</pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp34143880"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>outch</em></span> outputs <span class="emphasis"><em>asig1</em></span> on the channel determined by <span class="emphasis"><em>kchan1</em></span>, <span class="emphasis"><em>asig2</em></span> on the channel determined by <span class="emphasis"><em>kchan2</em></span>, etc.
</p>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Note">
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<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Note]" src="images/note.png" />
</td>
<th align="left">Note</th>
</tr>
<tr>
<td align="left" valign="top">
<p>
The highest number for <span class="emphasis"><em>kchanX</em></span> available for use with <span class="emphasis"><em>outch</em></span> depends on <a class="link" href="nchnls.html" title="nchnls"><em class="citetitle">nchnls</em></a>. If <span class="emphasis"><em>kchanX</em></span> is greater than <span class="emphasis"><em>nchnls</em></span>, <span class="emphasis"><em>asigX</em></span> will be silent. Note that <span class="emphasis"><em>outch</em></span> will give a warning but not an error in this case.
</p>
</td>
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</div>
<div class="refsect1" title="Examples">
<a id="idp34147952"></a>
<h2>Examples</h2>
<p>
Here is an example of the outch opcode. It uses the file <a class="ulink" href="examples/outch.csd" target="_top"><em class="citetitle">outch.csd</em></a>.
</p>
<div class="example">
<a id="idp34148920"></a>
<p class="title">
<strong>Example 538. Example of the outch 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 <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 outch.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> 5
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="oblock">instr</span> 1
asig <span class="opc">vco2</span> .05, 100 <span class="comment">; sawtooth waveform at low volume</span>
kcut <span class="opc">line</span> 100, p3, 30 <span class="comment">; Vary cutoff frequency</span>
kresonance <span class="op">=</span> .7
inumlayer <span class="op">=</span> 3
asig <span class="opc">lowresx</span> asig, kcut, kresonance, inumlayer
klfo <span class="opc">lfo</span> 4, .5, 4
klfo <span class="op">=</span> klfo<span class="op">+</span>1 <span class="comment">; offset of 1</span>
<span class="opc">printks</span> "signal is sent to channel <span class="op">%</span>d\\n", .1, klfo
<span class="opc">outch</span> klfo,asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 30
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
<pre class="screen">
signal is sent to channel 5
signal is sent to channel 4
signal is sent to channel 3
signal is sent to channel 2
signal is sent to channel 1
signal is sent to channel 5
........
</pre>
<p>
</p>
<p>
Here is another example of the outch opcode. It uses the file <a class="ulink" href="examples/outch.csd" target="_top"><em class="citetitle">outch-2.csd</em></a>.
</p>
<div class="example">
<a id="idp34152256"></a>
<p class="title">
<strong>Example 539. Another example of the outch 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 outch-2.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> 4
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="ohdr">seed</span> 0
<span class="oblock">instr</span> 1 <span class="comment">;random movements between 4 speakers with outch</span>
ichn1 <span class="opc">random</span> 1, 4.999 <span class="comment">;channel to start</span>
ichn2 <span class="opc">random</span> 1, 4.999 <span class="comment">;channel to end</span>
<span class="opc">prints</span> "Moving from speaker <span class="op">%</span>d to speaker <span class="op">%</span>d<span class="op">%</span>n", <span class="opc">int</span>(ichn1), <span class="opc">int</span>(ichn2)
asamp <span class="opc">soundin</span> "fox.wav"
kmov <span class="opc">linseg</span> 0, p3, 1
a1, a2 <span class="opc">pan2</span> asamp, kmov
<span class="opc">outch</span> <span class="opc">int</span>(ichn1), a1, <span class="opc">int</span>(ichn2), a2
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">r</span> 5
<span class="stamnt">i</span> 1 0 3
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp34153280"></a>
<h2>See Also</h2>
<p>
<a class="link" href="out32.html" title="out32"><em class="citetitle">out32</em></a>,
<a class="link" href="outc.html" title="outc"><em class="citetitle">outc</em></a>,
<a class="link" href="outx.html" title="outx"><em class="citetitle">outx</em></a>,
<a class="link" href="outz.html" title="outz"><em class="citetitle">outz</em></a>
</p>
<p> More information on this opcode: <a class="ulink" href="http://www.csounds.com/journal/issue16/audiorouting.html" target="_top"><em class="citetitle">http://www.csounds.com/journal/issue16/audiorouting.html</em></a> , written by Andreas Russo </p>
</div>
<div class="refsect1" title="Credits">
<a id="idp34156512"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: John ffitch</td>
</tr>
<tr>
<td>University of Bath/Codemist Ltd.</td>
</tr>
<tr>
<td>Bath, UK</td>
</tr>
<tr>
<td>May 2000</td>
</tr>
</table>
<p>
</p>
<p>New in Csound Version 4.07</p>
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