> Any pointers to get me started is greatly appreciated. you cannot evaluate a definstument. you have to compile a .ins file and load its .fasl into into lisp. try this in the repl assuming /path/to/clm is your clm directory: (load "/path/to/clm/all.lisp") (load (compile-file "/path/to/clm/v.ins")) (with-sound () (fm-violin 0 1 200 .1)) you should hear a friendly toot.