ottava = #(define-music-function (parser location octave) (number?)
  (_i "set the octavation ")
  (make-ottava-set octave)
)


\relative { 
  c4 c c c |
  #(set-octavation 1) c c c c|
  #(set-octavation -2) c c c c |
  \ottava #0 c4 c c c |
  \ottava #2 c c c c|
  \ottava #-1 c c c c|
  #(set-octavation 0) c c c c |
}