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<div class="refentry" title="locsend">
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<h2>
<span class="refentrytitle">locsend</span>
</h2>
<p>locsend —
Distributes the audio signals of a previous <span class="emphasis"><em>locsig</em></span> opcode.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp28546000"></a>
<h2>Description</h2>
<p>
<span class="emphasis"><em>locsend</em></span> depends upon the existence of a previously defined <a class="link" href="locsig.html" title="locsig"><em class="citetitle">locsig</em></a>. The number of output signals must match the number in the previous <span class="emphasis"><em>locsig</em></span>. The output signals from <span class="emphasis"><em>locsend</em></span> are derived from the values given for distance and reverb in the <span class="emphasis"><em>locsig</em></span> and are ready to be sent to local or global reverb units (see example below). The reverb amount and the balance between the 2 or 4 channels are calculated in the same way as described in the Dodge book (an essential text!).
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp28550640"></a>
<h2>Syntax</h2>
<pre class="synopsis">a1, a2 <span class="command"><strong>locsend</strong></span></pre>
<pre class="synopsis">a1, a2, a3, a4 <span class="command"><strong>locsend</strong></span></pre>
</div>
<div class="refsect1" title="Examples">
<a id="idp28604264"></a>
<h2>Examples</h2>
<p>
</p>
<div class="informalexample">
<pre class="programlisting">
asig some audio signal
kdegree <span class="opc">line</span> 0, p3, 360
kdistance <span class="opc">line</span> 1, p3, 10
a1, a2, a3, a4 <span class="opc">locsig</span> asig, kdegree, kdistance, .1
ar1, ar2, ar3, ar4 <span class="opc">locsend</span>
ga1 <span class="op">=</span> ga1<span class="op">+</span>ar1
ga2 <span class="op">=</span> ga2<span class="op">+</span>ar2
ga3 <span class="op">=</span> ga3<span class="op">+</span>ar3
ga4 <span class="op">=</span> ga4<span class="op">+</span>ar4
<span class="emphasis"><em>outq</em></span> a1, a2, a3, a4
<span class="oblock">endin</span>
<span class="oblock">instr</span> 99 <span class="comment">; reverb instrument</span>
a1 <span class="opc">reverb2</span> ga1, 2.5, .5
a2 <span class="opc">reverb2</span> ga2, 2.5, .5
a3 <span class="opc">reverb2</span> ga3, 2.5, .5
a4 <span class="opc">reverb2</span> ga4, 2.5, .5
<span class="opc">outq</span> a1, a2, a3, a4
ga1<span class="op">=</span>0
ga2<span class="op">=</span>0
ga3<span class="op">=</span>0
ga4<span class="op">=</span>0</pre>
</div>
<p>
</p>
<p>
In the above example, the signal, <span class="emphasis"><em>asig</em></span>, is sent around a complete circle once during the duration of a note while at the same time it becomes more and more <span class="quote">“<span class="quote">distant</span>”</span> from the listeners' location. <span class="emphasis"><em>locsig</em></span> sends the appropriate amount of the signal internally to <span class="emphasis"><em>locsend</em></span>. The outputs of the <span class="emphasis"><em>locsend</em></span> are added to global accumulators in a common Csound style and the global signals are used as inputs to the reverb units in a separate instrument.
For an example, see <a class="link" href="locsig.html" title="locsig"><em class="citetitle">locsig</em></a>.
</p>
<p>
<span class="emphasis"><em>locsig</em></span> is useful for quad and stereo panning as well as fixed placed of sounds anywhere between two loudspeakers. Below is an example of the fixed placement of sounds in a stereo field.
It uses the file <a class="ulink" href="examples/locsend_stereo.csd" target="_top"><em class="citetitle">locsend_stereo.csd</em></a>.
</p>
<div class="example">
<a id="idp28617136"></a>
<p class="title">
<strong>Example 396. Example of the locsend 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 locsend_stereo.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="ohdr">0dbfs</span> <span class="op">=</span> 1
ga1 <span class="opc">init</span> 0
ga2 <span class="opc">init</span> 0
<span class="oblock">instr</span> 1
krevsend <span class="op">=</span> p4
aout <span class="opc">diskin2</span> "beats.wav", 1, 0, 1
kdegree <span class="opc">line</span> 0, p3, 180 <span class="comment">;left to right</span>
kdistance <span class="opc">line</span> 1, p3, 30
a1, a2 <span class="opc">locsig</span> aout, kdegree, kdistance, p4
ar1, ar2 <span class="opc">locsend</span>
ga1 <span class="op">=</span> ga1<span class="op">+</span>ar1
ga2 <span class="op">=</span> ga2<span class="op">+</span>ar2
<span class="opc">outs</span> a1, a2
<span class="oblock">endin</span>
<span class="oblock">instr</span> 99 <span class="comment">; reverb instrument</span>
a1 <span class="opc">reverb2</span> ga1, 2.5, .5
a2 <span class="opc">reverb2</span> ga2, 2.5, .5
<span class="opc">outs</span> a1, a2
ga1 <span class="op">=</span> 0
ga2 <span class="op">=</span> 0
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; sine wave.</span>
<span class="stamnt">f</span> 1 0 16384 10 1
<span class="stamnt">i</span> 1 0 4 .1 <span class="comment">;with reverb</span>
<span class="stamnt">i</span> 1 + 4 0 <span class="comment">;no reverb</span>
<span class="stamnt">i</span>99 0 7
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
<p>
A few notes:
</p>
<div class="informalexample">
<pre class="programlisting">
<span class="comment">;place the sound in the left speaker and near:</span>
<span class="stamnt">i</span>1 0 1 0 1
<span class="comment">;place the sound in the right speaker and far:</span>
<span class="stamnt">i</span>1 1 1 90 25
<span class="comment">;place the sound equally between left and right and in the middle ground distance:</span>
<span class="stamnt">i</span>1 2 1 45 12
<span class="stamnt">e</span></pre>
</div>
<p>
</p>
<p>
The next example shows a simple intuitive use of the distance value to simulate Doppler shift. The same value is used to scale the frequency as is used as the distance input to <span class="emphasis"><em>locsig</em></span>.
</p>
<div class="informalexample">
<pre class="programlisting">
kdistance <span class="opc">line</span> 1, p3, 10
kfreq <span class="op">=</span> (ifreq <span class="op">*</span> 340) <span class="op">/</span> (340 <span class="op">+</span> kdistance)
asig <span class="opc">oscili</span> iamp, kfreq, 1
kdegree <span class="opc">line</span> 0, p3, 360
a1, a2, a3, a4 <span class="opc">locsig</span> asig, kdegree, kdistance, .1
ar1, ar2, ar3, ar4 <span class="opc">locsend</span></pre>
</div>
<p>
</p>
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<div class="refsect1" title="See Also">
<a id="idp28626928"></a>
<h2>See Also</h2>
<p>
<a class="link" href="locsig.html" title="locsig"><em class="citetitle">locsig</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp28627984"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Richard Karpen</td>
</tr>
<tr>
<td>Seattle, WA USA</td>
</tr>
<tr>
<td>1998</td>
</tr>
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<p>
</p>
<p>New in Csound version 3.48</p>
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