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---

Changing time signatures inside a polymetric section using \scaleDurations

The measureLength property, together with measurePosition, determines when a bar line is needed. However, when using \scaleDurations, the scaling of durations makes it difficult to change time signatures. In this case, measureLength should be set manually, using the ly:make-moment callback. The second argument must be the same as the second argument of \scaleDurations.

\layout {
  \context {
    \Score
    \remove "Timing_translator"
  }
  \context {
    \Staff
    \consists "Timing_translator"
  }
}

<<
  \new Staff {
    \scaleDurations 8/5 {
      \time 6/8
      \set Timing.measureLength = \musicLength 1*6/5
      b8 b b b b b
      \time 2/4
      \set Timing.measureLength = \musicLength 1*4/5
      b4 b
    }
  }
  \new Staff {
    \clef bass
    \time 2/4
    c2 d e f
  }
>>

---

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