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you can filter all events by length (>= min).

all other events will be replaced by rests...

 


(defun filter-events-by-length (omnlist &key min)
  (let ((omnlist (single-events omnlist))
        (min (car (omn :length (list min)))))
    (flatten 
     (length-rest-merge 
      (loop for i in omnlist
        when (>= (car (omn :length i)) min)
        collect i
        else collect (neg! (car (omn :length i))))))))


(filter-events-by-length '(e c4 d4 e4 e5 q c4 d4 e4 h c4 d4 e4) :min 'e)
=> (e c4 mf e d4 mf e e4 mf e e5 mf q c4 mf q d4 mf q e4 mf h c4 mf h d4 mf h e4 mf)

(filter-events-by-length '(e c4 d4 e4 e5 q c4 d4 e4 h c4 d4 e4) :min 'q)
=> (-h q c4 mf q d4 mf q e4 mf h c4 mf h d4 mf h e4 mf)

(filter-events-by-length '(e c4 d4 e4 e5 q c4 d4 e4 h c4 d4 e4) :min 'h)
=> (-wq h c4 mf h d4 mf h e4 mf)

 

 

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@janusz: you could expand it with conditionals like >, <, =, span .... and implement it....

and... if you would write this function with conditionals for pitches (sequences of pitches) you could filter by vector-envelope...

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