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<refentry id="kr">
<indexterm id="IndexKr"><primary>kr</primary></indexterm>
<refentryinfo><title>Orchestra Syntax:Header</title></refentryinfo>
<refmeta>
<refentrytitle>kr</refentrytitle>
</refmeta>
<refnamediv>
<refname>kr</refname>
<refpurpose>
Sets the control rate.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
These statements are global value <link linkend="assign"><citetitle>assignments</citetitle></link>, made at the beginning of an orchestra, before any instrument block is defined. Their function is to set certain <link linkend="VariableTypes"><citetitle>reserved symbol variables</citetitle></link> that are required for performance. Once set, these reserved symbols can be used in expressions anywhere in the orchestra.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis><command>kr</command> = iarg</synopsis>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>kr</emphasis> = (optional) -- set control rate to <emphasis>iarg</emphasis> samples per second. The default value is 4410.
</para>
<para>
In addition, any <link linkend="GlobalVariables"><citetitle>global variable</citetitle></link> can be initialized by an <emphasis>init-time assignment</emphasis> anywhere before the first <link linkend="instr"><citetitle>instr statement</citetitle></link>. All of the above assignments are run as instrument 0 (i-pass only) at the start of real performance.
</para>
<para>
Beginning with Csound version 3.46, <emphasis>kr</emphasis> can be omitted. Csound will use the default values, or calculate <emphasis>kr</emphasis> from defined <link linkend="ksmps"><citetitle>ksmps</citetitle></link> and <link linkend="sr"><citetitle>sr</citetitle></link>. It is usually better to just specify <link linkend="ksmps"><citetitle>ksmps</citetitle></link> and <link linkend="sr"><citetitle>sr</citetitle></link> and let csound calculate <emphasis>kr</emphasis>.
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
<informalexample>
<programlisting>
<emphasis role="ohdr">sr</emphasis> <emphasis role="op">=</emphasis> 10000
<emphasis role="ohdr">kr</emphasis> <emphasis role="op">=</emphasis> 500
<emphasis role="ohdr">ksmps</emphasis> <emphasis role="op">=</emphasis> 20
gi1 <emphasis role="op">=</emphasis> <emphasis role="ohdr">sr</emphasis><emphasis role="op">/</emphasis>2.
ga <emphasis role="opc">init</emphasis> 0
itranspose <emphasis role="op">=</emphasis> <emphasis role="opc">octpch</emphasis>(.0l)</programlisting>
</informalexample>
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<link linkend="ksmps"><citetitle>ksmps</citetitle></link>,
<link linkend="nchnls"><citetitle>nchnls</citetitle></link>,
<link linkend="nchnls_i"><citetitle>nchnls_i</citetitle></link>,
<link linkend="sr"><citetitle>sr</citetitle></link>
</para>
</refsect1>
</refentry>
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