(@up         note/pos   :note-pos-next)
(@down       note/pos   :note-pos-prev)
(@comma      note/len   :note-length-prev)
(@period     note/len   :note-length-next)
(@plus       note/range :note-range-next-)
(@underscore note/range :note-range-prev-)

(@left  time/pos  :time-pos-next)
(@right time/pos  :time-pos-prev)
(@equal time/zoom :time-zoom-prev)
(@minus time/zoom :time-zoom-next)
(@z     time/lock)

(@enter       add :false)
(@shift-enter add :true)
(@del         del :false)
(@shift-del   del :true)