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<section id="OrchIblock">
<title>Instrument and Opcode Block Statements</title>
<para>
An instrument block is comprised of <emphasis>ordinary statements</emphasis> that set values, control the logical flow, or invoke the various signal processing subroutines that lead to audio output. Statements that define an instrument block are:
<itemizedlist>
<listitem>
<para><link linkend="instr"><citetitle>instr</citetitle></link></para>
</listitem>
<listitem>
<para><link linkend="endin"><citetitle>endin</citetitle></link></para>
</listitem>
</itemizedlist>
An instrument block looks like this:
<programlisting>
<emphasis role="oblock">instr</emphasis> 1 <emphasis role="comment">;A simple sine wave oscillator</emphasis>
aout <emphasis role="opc">oscils</emphasis> 10000, 440, 0
out <emphasis role="opc">aout</emphasis>
<emphasis role="oblock">endin</emphasis></programlisting>
</para>
<para>
Statements that define a user defined opcode (UDO) block are
<itemizedlist>
<listitem>
<para><link linkend="opcode"><citetitle>opcode</citetitle></link></para>
</listitem>
<listitem>
<para><link linkend="endop"><citetitle>endop</citetitle></link></para>
</listitem>
</itemizedlist>
See the <link linkend="OrchUDO"><citetitle>UDO</citetitle></link> section for more information.
</para>
</section>
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