\new Staff {
<<
\new Voice \with {
- \consists Mark_engraver
+ \consists "Mark_engraver"
\consists "Staff_collecting_engraver"
}
{ c4 d e f
c4 d e f
}
\new Voice \with {
- \consists Mark_engraver
+ \consists "Mark_engraver"
\consists "Staff_collecting_engraver"
\override RehearsalMark #'direction = #DOWN
}