Adding volta brackets to additional staves
The Volta_engraver by default resides in the Score context, and brackets for the repeat are thus normally only printed over the topmost staff. This can be adjusted by adding the Volta_engraver to the Staff context where the brackets should appear; see also the “Volta multi staff” snippet.
\version "2.24.0"
<<
\new Staff { \repeat volta 2 { c'1 } \alternative { c' } }
\new Staff { \repeat volta 2 { c'1 } \alternative { c' } }
\new Staff \with { \consists "Volta_engraver" } { c'2 g' e' a' }
\new Staff { \repeat volta 2 { c'1 } \alternative { c' } }
>>
