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<refentry id="opa">
<indexterm id="IndexA"><primary>a</primary></indexterm>
<refentryinfo><title>Signal Modifiers:Sample Level Operators</title></refentryinfo>
<refmeta>
<refentrytitle>a</refentrytitle>
</refmeta>
<refnamediv>
<refname>a</refname>
<refpurpose>
Converts a k-rate parameter to an a-rate value with interpolation.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
Converts a k-rate parameter to an a-rate value with interpolation.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis><command>a</command>(x) (control-rate args only)</synopsis>
<para>
where the argument within the parentheses may be an expression. Value converters perform arithmetic translation from units of one kind to units of another. The result can then be a term in a further expression.
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Here is an example of the a opcode. It uses the file <ulink url="examples/opa.csd"><citetitle>opa.csd</citetitle></ulink>.
<example>
<title>Example of the a 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/opa.csd.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
</example>
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<link linkend="opi"><citetitle>i</citetitle></link>,
<link linkend="opk"><citetitle>k</citetitle></link>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>Author: &namegabriel;</para>
<para>Example written by &namekevin;.</para>
<para>New in version 4.21</para>
</refsect1>
</refentry>
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