\version "2.24.2"
\score {
\new Staff \relative c {
\clef bass
\time 4/4
\mark\markup{\box{\bold A}}
\repeat volta 4 {} \alternative{
{
c8 d e f g f e d
}
}
\break
\mark\markup{\box{\bold B}}
\repeat volta 4 {} \alternative{
{
g8 f e d c d e f
}
}
}
}
\tuplet 14/12 {f,32 g b d g b d f d b g d b g}
(Alternativ wäre die alte Syntax \times 12/14 ... möglich)