+Balloon text normally influences note spacing, but this can be
+altered:
+
+@lilypond[verbatim,quote,relative=2]
+\new Voice \with { \consists "Balloon_engraver" }
+{
+ \balloonLengthOff
+ \balloonGrobText #'Stem #'(3 . 4) \markup { "I'm a Stem" }
+ a8
+ \balloonGrobText #'Rest #'(-4 . -4) \markup { "I'm a rest" }
+ r
+ \balloonLengthOn
+ <c, g'-\balloonText #'(-2 . -2) \markup { "I'm a note head" } c>2.
+}
+@end lilypond
+
+
+@predefined
+
+@funindex balloonLengthOn
+@funindex balloonLengthOff
+@funindex \balloonLengthOn
+@funindex \balloonLengthOff
+
+@code{\balloonLengthOn}, @code{\balloonLengthOff}