Re: polyrhythm with multiple tempi

[Lukas-Fabian Moser]

Hi Kieren,

Am 10.12.19 um 22:54 schrieb Kieren MacMillan:
> Hi all,
>
> Please consider the following snippet:
>
> %%%  SNIPPET BEGINS
> \version "2.19.83"
>
> \layout {
>    \context {
>      \Score
>      \remove "Timing_translator"
>      \remove "Default_bar_line_engraver"
>      \remove "Metronome_mark_engraver"
>    }
>    \context {
>      \Staff
>      \consists "Timing_translator"
>      \consists "Default_bar_line_engraver"
>      \consists "Metronome_mark_engraver"
>    }
> }
>
> slower = {
>    \tempo 4=80
>    \scaleDurations 120/80 { \repeat unfold 12 { c'4 } }
> }
>
> faster = {
>    \tempo 4=120
>    \repeat unfold 16 { c'4 }
> }
>
> \score {
>    <<
>      \new Staff \slower
>      \new Staff \faster
>    >>
> }
> %%%  SNIPPET ENDS
>
> The polyrhythm stretches out and lines up as expected, but I can’t seem to get 
> the barlines to offset [despite moving the engravers I thought were required]. 
> Corrections/hints appreciated.

\scaleDurations does not scale the measure length as well. Try inserting

  \set Timing.measureLength = #(ly:make-moment 12/8)

in the \slower part.

See you in Salzburg!
Lukas