remove first empty staff and ambitus

[Kai Lautenschläger]

Dear list,

a few weeks ago I asked about removing the first empty staff in choir music and 
inserting the ambitus in the n-th system for selected voices. From the answers 
you gave, I could built the following example, which solved a whole set of 
problems.

Now, can anyone come up with an idea how to remove the upper staff in the first 
system? I’m grateful for any hints. Thanks

best regards, Kai

 \version "2.19.15"

musicI = \relative { \repeat unfold 5 { c'4^"first voice" b' c, g' } }
musicII = \relative { \repeat unfold 5 { c''4^"second voice" b' c, g' } }
ambitus = \with { \consists "Ambitus_engraver" }
noAmbitusAtEnd = {
  \override Voice.AmbitusNoteHead.break-visibility = ##(#f #f #t)
  \override Voice.AmbitusLine.break-visibility = ##(#f #f #t)
}

\score {
  <<
    \new Staff = "StaffI"
    \new Voice = "VoiceI" { s1*5 \break \new Voice \ambitus \musicI }
    \new Staff = "StaffII"
    \new Voice = "VoiceII" \ambitus { \musicII }
  >>
  \layout {
    \context {
      \Staff
      \RemoveEmptyStaves
      \override Staff.VerticalAxisGroup.remove-first = ##t
      \noAmbitusAtEnd

    }
  }
}


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