Hi, I am quite in a hurry, sorry for being a little silent - the new doc design is pretty nice!! I encountered a presumably small transposing problem, when I use :auto-accidentals nil. This one causes an error: (fomus:fomus-init :backend '(:lilypond :view t) :use-cm t :auto- accidentals nil :transpose t) (fomus:fomus-newpart :bass-clarinet :instr :bass-clarinet :name "bass- clarinet") (fomus:fomus-newnote :bass-clarinet :off 0 :dur 1 :note '(e4 n) :marks nil) (fomus:fomus-exec) This one is fine: (fomus:fomus-init :backend '(:lilypond :view t) :use-cm t :auto- accidentals t :transpose t) (fomus:fomus-newpart :bass-clarinet :instr :bass-clarinet :name "bass- clarinet") (fomus:fomus-newnote :bass-clarinet :off 0 :dur 1 :note 64 :marks nil) (fomus:fomus-exec) A bientôt, -Kilian