Editing Polymetric section: printing full-measure rests

This situation seems to come up when the following conditions are met:<br />


* We are using a global “invisible” voice in every staff for line breaking.
* The music in one or more staves is compressed so that its barlines are out of sync with the barlines of the global voice.

<br />
The problem is that although notes and ordinary rests compress in the offending staves, full measure rests adhere to the time of the global voice.<br />
The solution is to scale the \time value for offending staves by a fraction of the global voice full-measure rest length.<br />
In the example below, there are nine 3/8 measures in the time of four 3/8 measures. The nine are therefore compressed by 4/9ths. To get appropriate length full-measure rests in the nine, we must set the \time value for the nine bars to 4/9ths of 3/8, or 1/6.<br />
We can then display a “dummy” 3/8 time signature.<br />
You can see the error by replacing the 1/6 with 3/8 in the compressMusic block.

<lilypond version="2.24">
%% http://lsr.di.unimi.it/LSR/Item?id=329

\paper { 	
  ragged-right = ##t
}

\layout { 
  \context { 
    \Score
    \remove "Timing_translator"
    \remove "Time_signature_engraver"
    \override SpacingSpanner.uniform-stretching = ##t
    \override SpacingSpanner.strict-note-spacing = ##t
    proportionalNotationDuration = #(ly:make-moment 1/64)
  }
  \context { 
    \Staff
  \consists "Timing_translator"
  \consists "Time_signature_engraver"
  }
}

global = { 
  \set Timing.measureBarType = ""
  \repeat unfold 4 { s4. } \bar "" \break
}

\new Score { <<
  \new StaffGroup { <<
    \new Staff <<
      \global
      {
        \time 3/8
        \repeat unfold 2 { R4. \bar "|" c'8[c'8 c'8] \bar "|" } 
      }
    >>
    \new Staff <<
      \global
      {
        \scaleDurations #'(4 . 9) { 
          \time 1/6
          \set Staff.timeSignatureFraction = #'(3 . 8)
          \repeat unfold 3 { R4. \bar "|" c'8[c'8 c'8] \bar "|" R4. \bar "|"}
        }	
      }
    >>
  >> }

>> }
</lilypond>

[[Category:Contemporary notation]]
[[Category:Contemporary notation]]
[[Category:Rhythms]]
[[Category:Specific notation]]
[[Category:Workaround]]
[[Category:Contexts and engravers]]
[[Category:Snippet]]