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to use the function which works on event-numbers, first you have to number it (the score), so that you could work with this afterwards... ;;; ADD numbers to text attributes (can do that in your setup), then ADD number to events ;;; have a look to the example. after that, easy to use REPLACE-ON-EVENT-NUMBER etc... (defun add-numbers-to-text-attributes (a b) (loop for i from a to b append (add-text-attributes (list (compress (list 'nr i)) (write-to-string i))))) (add-numbers-to-text-attributes 0 100) (defun add-num-to-events (omnlist) (loop for x in (single-events omnlist) for i from 0 to (length (single-events omnlist)) when (omn-formp x) collect (omn-replace :articulation (list (compress (list 'nr i))) x) else collect x)) ;;; evaluate cmd3 (setf seq (add-num-to-events '(-q q c4 mp -q -q e e e e e q c4 mp -q -q q c4 mp -q))) => ((-q) (q c4 mp nr1) (-q) (-q) (e c4 mp nr4) (e c4 mp nr5) (e c4 mp nr6) (e c4 mp nr7) (e c4 mp nr8) (q c4 mp nr9) (-q) (-q) (q c4 mp nr12) (-q))