Hi, thanks for solving my last problem via cvs :) I have some more questions: I am doing this to get a cello double-stop: (fomus-init :ensemble-type :orchestra) (fomus-newpart 1 :name "Cello" :instr :cello) (fomus-newnote 1 :off 0 :dur 2 :note 61) (fomus-newnote 1 :off 0 :dur 2 :note 55) (fomus-newnote 1 :off 2 :dur 1 :note 45) (fomus-exec) Which returns this error: Cannot distribute voices for part "Cello" [Condition of type SIMPLE-ERROR] Well, I understand that the voicelim for cello is 1, but does a chord, in which all the notes have the same duration already need more than one voice? I was trying to override the instr settings by changing the first line to: (fomus-init :ensemble-type :orchestra :instruments (list (make-instr :cello :clefs '(:bass) :voicelim 2))) .... Which brings up: Undefined function VOICELIM called with arguments (#S(INSTR :SYM :CELLO :CLEFS (:BASS) :STAVES 1 :MINP NIL :MAXP ...)) . Sorry for not tracking this further down - I suspected that (voicelim ...) was erroneously called instead of (instr-voicelim ...), but I did not really succeed... I have to first of all read more of your code. Ciao, Kilian Sprotte