A4.xml

<refentry id="A4">
<indexterm id="IndexA4"><primary>A4</primary></indexterm>
  <refentryinfo><title>Orchestra Syntax:Header</title></refentryinfo>
  <refmeta>
    <refentrytitle>A4</refentrytitle>
  </refmeta>



  <refnamediv>
    <refname>A4</refname>

    <refpurpose>
      Sets the base frequency for pitch A4.
    </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>A4</command> = iarg</synopsis>
  </refsect1>

  <refsect1>
    <title>Initialization</title>
    <para>
      <emphasis>A4</emphasis>  = (optional) -- set reference frequency
      for pitch A4 to <emphasis>iarg</emphasis> Hertz. The default value is 440.
    </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 6.08, <emphasis>A4</emphasis> may
      be used.  It affects the behaviour of the opcodes
      <emphasis>cpspch</emphasis>, <emphasis>cpsoct</emphasis>,
      <emphasis>cps2pch</emphasis>, <emphasis>cpsxpch</emphasis> and
      <emphasis>cpsmidinn</emphasis>.
    </para>
  </refsect1>

  <refsect1>
    <title>See Also</title>
    <para>
      <link linkend="sr"><citetitle>sr</citetitle></link>,
      <link linkend="kr"><citetitle>kr</citetitle></link>,
      <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="Zerodbfs"><citetitle>0dbfs</citetitle></link>,
      <link linkend="cpspch"><citetitle>cpspch</citetitle></link>,
      <link linkend="cpsoct"><citetitle>cpsoct</citetitle></link>,
      <link linkend="cpsmidinn"><citetitle>cpsmidinn</citetitle></link>,
      <link linkend="cps2pch"><citetitle>cps2pch</citetitle></link>,
      <link linkend="cpsxpch"><citetitle>cpsxpch</citetitle></link>.
    </para>
  </refsect1>
  <refsect1>
    <title>Credits</title>
    <para>
      <simplelist>
        <member>Authors: &namejohn;</member>
        <member>September 2016</member>
      </simplelist>
    </para>

    <para>New in Csound Version 6.08</para>

  </refsect1>
</refentry>