gen - the cmusic generate command

The cmusic gen command has the general form:

    gen T PROG FUNC DEF ;

where:
    T    is the action time (such as "0", or "p2"),
    PROG is the gen program to be used (such as "gen1"),
    FUNC is the function to be defined (such as "f1"), and
    DEF  is the definition required by the program being used.

Cmusic constructs a system call from the gen command statement which has
the form:

    PROG -Ln IDEF

where:
    PROG is the gen program named in the command,
    n    is the current function length (supplied as a flag argument), and
    IDEF is the interpreted definition, i.e., the definition as supplied in
	 the gen score statement with all arithmetic expressions replaced
	 by their numerical values.

For instance, the score statement

    gen 0 gen2 f1 0,0 1,2K;

causes cmusic to produce the following system call (assuming the default 
function length is 1024):

    gen2 -L1024 0 0 1 2048

The gen2 program then is expected to produce 1024 binary float values on its
standard output.  Cmusic reads these values from a pipe and stores them into 
them into the memory allocated for function f1.

The user may use the standard gen programs (see "help/cmusic/gens") or
may supply a special program simply by naming it.  The contents of any 
string variables in the function definition are copied verbatim to
the system call, allowing flags to be set in the called program.
For instance the score statements

    set funclength = 4K;
    var p2 s1 "-F2 -G3";
    var p2 s2 "arg";
    gen p2 ./mygen f2 s1 3,4 s2 5;

cause cmusic to execute the call:

    ./mygen -L4096 -F2 -G3 3 4 arg 5

Presumably the user's "mygen" program knows what to do with the flags and
other arguments, and it is expected to produce 4096 binary float values 
on its standard output for use in defining function f2.

The standard gen programs are documented individually.  See

    help cmusic/gens