- \once\override Stem #'print-function = #Balloon_interface::print
- \once\override Stem #'balloon-original-callback = #Stem::print
- \once\override Stem #'balloon-text = #"I'm a stem"
- \once\override Stem #'balloon-text-offset = #'(3 . 4)
- \once\override Stem #'balloon-text-props
+ \once\override Stem #'callbacks #'stencil = #Balloon_interface::print
+ \once\override Stem #'balloon-original-callback = #Stem::print
+ \once\override Stem #'balloon-text = #"I'm a stem"
+ \once\override Stem #'balloon-text-offset = #'(3 . 4)
+ \once\override Stem #'balloon-text-props