\version "2.18.2"
\include "openlilylib"
\include "editorial-tools/edition-engraver/definitions.ily"

\editionMod score 5 0/8 score.Staff.A \set Staff.timeSignatureFraction = 3/2

uppermusic = \relative c' {
  \time 3/2
  \repeat unfold 8 { c2 c c }
}

lowermusic = \relative c' {
  \time 3/2
  \set Staff.timeSignatureFraction = 18/8
  \scaleDurations 12/18 {
    \repeat unfold 8 { \repeat unfold 18 c8 }
  }
}

\addEdition score

\layout {
  \context {
    \Voice
    \consists \editionEngraver ##f
  }
  \context {
    \Staff
    \consists \editionEngraver score
  }
  \context {
    \Score
    \consists \editionEngraver score
  }
}
% score
\score {
  {
    <<
      \new Staff = upper { \uppermusic }
      \new Staff = lower { \lowermusic }
    >>
  }
}