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I can't seem to get do-timeline2 function to work. I include an abridged example below; happy to share more code details if necessary. I'd like to filter 64 measures of 4/4 as defined in the timeline. Would anyone be able to offer some feedback? I tried adjusting different 'list' levels, etc. but with no avail. Thank you! (setf chords1 '(e2b2g3d4 e2cs3a3e4 e2d3b3fs4)) (setf chords2 (pitch-transpose 3 chords1)) (setf chorale1-chords (span '(1 1 1 1 1 1 1 1) chords1)) (setf chorale2-chords (span '(1 1 1 1 1 1 1 1) chords2)) ;; OMNS (setf chorale1 (make-omn :length (length-span '(1 1 1 1 1 1 1 1) '(w) :omn t) :pitch chorale1-chords)) (setf chorale2 (make-omn :length (length-span '(1 1 1 1 1 1 1 1) '(w) :omn t) :pitch chorale2-chords)) ;; CHORALE RESERVOIRES (setf chorales-reservoir (list chorale1 chorale2)) (setf chorales-map (vector-map chorales-reservoir '(0 4 7 12 16 7 12 16))) ;; TIMELINE (setf chorales-timeline '((1 0 1 0 1 0 1 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 1 0 0 0 0 1 1 1 1 1 1 0 0 0 0 0 0))) (do-timeline2 '(chorales-map) chorales-timeline '(gen-pause x))