repeat volta with partial, alternative endings and different \time in different voices

[Jonathan Scholbach]

Hello again ;-)

I have a somewhat special piece of music: It has a partial and a volta
with alternative endings. That's no problem. But on top it has different
meters in the alternatives of the different voices. When I do not
combine the voices in a ChoirStaff (or StaffGroup) everything works
fine. But as soon as I put them together in a << >> the volta-bar :|
vanishes. Do you have a solution for that? I am looking for a way to
solve this without setting the volta-bar manually, since I want to
produce adequate midi output, too.

My minimal example:

\version "2.19.22"

global = { \time 3/2  \partial 2 }

first = \relative c' {
  \repeat volta 2 { c2 \time 4/4 c4 c c c }
    \alternative {
       { \time 3/2
         \set Timing.measureLength = #(ly:make-moment 1)
         c1
       }
       { \time 3/2
         \set Timing.measureLength = #(ly:make-moment 1)
        d1
       }
     }
     \time 4/4 c4 c c c
}

second =  \relative c' {
     \repeat volta 2 { c2 \time 4/4 c4 c c c }
     \alternative {
       { \time 3/2
         \set Timing.measureLength = #(ly:make-moment 1)
         c1
       }
       { \time 5/4
         \set Timing.measureLength = #(ly:make-moment 5/4)
        c4 d e f
       }
     }
     g
     \time 4/4 c4 c c c
}

% this works:
\score { \new Staff { \global \first } }
\score { \new Staff { \global \second } }

% that does not work:
\score {
  \new ChoirStaff <<
    \new Staff { \new Voice { \global \first } }
    \new Staff { \new Voice { \global \second } }
  >>

  \layout {
    \context {
      \Score
        \remove "Timing_translator"
        \remove "Default_bar_line_engraver"
    }
    \context {
      \Staff
        \consists "Timing_translator"
        \consists "Default_bar_line_engraver"
    }
  }%end of \layout
}%end of \score


Thank you for your help!

Jonathan