if you like to change dynamics/velocity of specific lengths

 

(defun replace-velocity-of-a-length (omnseq length/velocity-map)
  (loop for i in (single-events (flatten omnseq))
    when (length-restp (car i)) collect i
    else append (omn-replace :velocity (cadr (assoc (car (omn :length i)) length/velocity-map))
                              i)))
                   

(setf omn-seq '(s c4 ffff e e s e. s q q q q q))                   

(replace-velocity-of-a-length omn-seq '((1/16 mp)
                                        (2/16 pp)
                                        (3/16 ppp)))

=> (s c4 mp e c4 pp e c4 pp s c4 mp e. c4 ppp s c4 mp q c4 ffff q c4 ffff q c4 ffff q c4 ffff q c4 ffff)

 

i did not realize that there is an OPMO-function for that 😕

 

in OPMO:

(setf omn-seq '(s c4 ffff e e s e. s q q q q q))                   

(length-map '((1/16 mp)
              (2/16 pp)
              (3/16 ppp)) omn-seq)
=> (s c4 mp e pp c4 s mp e. ppp s mp q ffff c4 c4 c4 c4)

 

Great!! 

Always good to see your loop functions!