- \once \property Voice.BreathingSign \override #'molecule-callback = #Breathing_sign::divisio_maxima
- \once \property Voice.BreathingSign \override #'Y-offset-callbacks = #'()
+ \once \override BreathingSign #'print-function = #Breathing_sign::divisio_maxima
+ \once \override BreathingSign #'Y-offset-callbacks = #'()