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<refentry id="spsend">
<indexterm id="IndexSpsend"><primary>spsend</primary></indexterm>
<refentryinfo><title>Signal Modifiers:Panning and Spatialization</title></refentryinfo>
<refmeta>
<refentrytitle>spsend</refentrytitle>
</refmeta>
<refnamediv>
<refname>spsend</refname>
<refpurpose>
Generates output signals based on a previously defined <emphasis>space</emphasis> opcode.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
<emphasis>spsend</emphasis> depends upon the existence of a previously defined <link linkend="space"><citetitle>space</citetitle></link>. The output signals from <emphasis>spsend</emphasis> are derived from the values given for xy and reverb in the <emphasis>space</emphasis> and are ready to be sent to local or global reverb units (see example below).
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>a1, a2, a3, a4 <command>spsend</command></synopsis>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
The configuration of the xy coordinates in space places the signal in the following way:
<itemizedlist>
<listitem>
<para>a1 is -1, 1</para>
</listitem>
<listitem>
<para>a2 is 1, 1</para>
</listitem>
<listitem>
<para>a3 is -1, -1</para>
</listitem>
<listitem>
<para>a4 is 1, -1</para>
</listitem>
</itemizedlist>
</para>
<para>
This assumes a loudspeaker set up as a1 is left front, a2 is right front, a3 is left back, a4 is right back. Values greater than 1 will result in sounds being attenuated, as if in the distance. <emphasis>space</emphasis> considers the speakers to be at a distance of 1; smaller values of xy can be used, but <emphasis>space</emphasis> will not amplify the signal in this case. It will, however balance the signal so that it can sound as if it were within the 4 speaker <emphasis>space</emphasis>. x=0, y=1, will place the signal equally balanced between left and right front channels, x=y=0 will place the signal equally in all 4 channels, and so on. Although there must be 4 output signals from <emphasis>space</emphasis>, it can be used in a 2 channel orchestra. If the xy's are kept so that Y>=1, it should work well to do panning and fixed localization in a stereo field.
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Here is a stereo example of the spsend opcode. It uses the file <ulink url="examples/spsend.csd"><citetitle>spsend.csd</citetitle></ulink>.
<example>
<title>Example of the spsend opcode.</title>
<para>See the sections <link linkend="UsingRealTime"><citetitle>Real-time Audio</citetitle></link> and <link linkend="CommandFlags"><citetitle>Command Line Flags</citetitle></link> for more information on using command line flags.</para>
<xi:include href="examples-xml/spsend.csd.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
</example>
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<link linkend="space"><citetitle>space</citetitle></link>,
<link linkend="spdist"><citetitle>spdist</citetitle></link>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>
<simplelist>
<member>Author: Richard Karpen</member>
<member>Seattle, WA USA</member>
<member>1998</member>
</simplelist>
</para>
<para>New in Csound version 3.48</para>
</refsect1>
</refentry>
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