(timing ,boolean? "Keep administration of measure length,
position, bar number, etc.? Switch off for cadenzas.")
(tonic ,ly:pitch? "The tonic of the current scale.")
+ (topLevelAlignment ,boolean? "If true, the @var{Vertical_align_engraver}
+will create a @var{VerticalAlignment}; otherwise, it will create a
+@var{StaffGrouper}")
(trebleStaffProperties ,list? "An alist of property settings to
apply for the up staff of @code{PianoStaff}. Used by
@code{\\autochange}.")