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<TITLE>SYNTAX_OF_THE_ORCHESTRA</TITLE>
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<H2>
SYNTAX OF THE ORCHESTRA</H2>
An orchestra statement in <B>Csound</B> has the format:
<PRE> label: result opcode argument1, argument2, ... ;comments</PRE>
The label is optional and identifies the basic statement that follows as
the potential target of a go-to operation (see <A HREF="./progctr.html">Program
Control Statements</A>). A label has no effect on the statement per se.
<P>Comments are optional and are for the purpose of letting the user document
his orchestra code. Comments always begin with a semicolon (;) and extend
to the end of the line.
<P>The remainder (result, opcode, and arguments) form the <I>basic statement</I>.
This also is optional, i.e. a line may have only a label or comment or
be entirely blank. If present, the basic statement must be complete on
one line. The opcode determines the operation to be performed; it usually
takes some number of input values (arguments); and it usually has a result
field variable to which it sends output values at some fixed rate. There
are four possible rates:
<P>(1) once only, at orchestra setup time (effectively a permanent assignment);
<P>(2) once at the beginning of each note (at initialization (init) time:
<I>I-rate</I>);
<P>(3) once every performance-time control loop (perf time control rate,
or <I>K-rate</I>);
<P>(4) once each sound sample of every control loop (perf time audio rate,
or <I>A-rate</I>).
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