\override Staff.StaffSymbol.line-positions = #'(-5 -2 -1 2 5 6)
\override Staff.StaffSymbol.ledger-positions = #'(-5 (-2 -1) 2)
\override Staff.StaffSymbol.ledger-extra = #1
\override Staff.StaffSymbol.line-positions = #'(-5 -2 -1 2 5 6)
\override Staff.StaffSymbol.ledger-positions = #'(-5 (-2 -1) 2)
\override Staff.StaffSymbol.ledger-extra = #1