label: result opcode argument1, argument2, ... ;commentsThe label is optional and identifies the basic statement that follows as the potential target of a go-to operation (see Program Control Statements). A label has no effect on the statement per se.
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.
The remainder (result, opcode, and arguments) form the basic statement. 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:
(1) once only, at orchestra setup time (effectively a permanent assignment);
(2) once at the beginning of each note (at initialization (init) time: I-rate);
(3) once every performance-time control loop (perf time control rate, or K-rate);
(4) once each sound sample of every control loop (perf time audio rate, or A-rate).