For a system-wide CLM instrument, e.g. "wurley" 

[ which is listed in http://www-ccrma.stanford.edu/software/clm/clm/ins ]
[ with info:   wurley            prc96.ins          Perry Cook's Wurlitzer ]


1) copy source code to directory that you are running lisp in from /usr/ccrma/lisp/src/clm-2

cp /usr/ccrma/lisp/src/clm-2/prc96.ins .

2) compile the source code

(compile-file "prc96.ins" :verbose nil)

3) load the resulting .fas file

(load "prc96")

4) enjoy -- you will need to ascertain the instrument's parameters directly from the source code file, e.g., wurley's definstrument shows 4 parameters:

(definstrument wurley (beg dur freq amp)