Note Event

The note event is basically just a shallow container for a MIDI note that doesn't do anything on its own.

You can use the mapper applicator to convert it to an OSC event (no MIDI out at this point).

(fun to-piano (event)
    ;; send note converts to ctrl event 
    (ctrl 
      (osc-send 'osc-client "/control/me"
         (ev-param :note event)
         (to-string  (ev-param :dur event)))))

(sx 'ba #t
  (cmp
    (mapper to-piano)
    (nuc 'tra (note 44 4)) ;; midi note 44, quarter
  ))

The functions midi-mul, midi-add, midi-sub and midi-div allow you to work with midi notes the same way you'd work with frequencies in Mégra:

(sx 'ba #t
  (cmp
    (mapper to-piano)
    (pear :p 12 (midi-add 2) :p 12 (midi-sub 3))
    (nuc 'tra (note 44 4)) ;; midi note 44, quarter
  ))