That’s enlightening; thanks Kieren! I would add the following near beginning of the code:
\unset systemStartDelimiter So it looks like: \defineBarLine "|-dashedSpan" #'(#t #f "!!") \layout { \context { \GrandStaff \name GrandStaffDashed \override SpanBar.glyph-name = #"|-dashedSpan" \unset systemStartDelimiter } But I didn’t know you can name a StaffGrouper like that (“GrandStaffDashed”) … Learning new things every day. Many thanks, Yoshi