Another possible approach, for the temporary time changes, is can you
display the new time signature without actually setting it? (Ie if the
piece is in 2/4, you display 3/4 but lilypond still thinks its a 2/4 bar
as before with no change.
Then just use \times 2/3 {} for that bar so the notation displays correctly.
Okay, that won't work for midi, but for scores it might be a good solution.
This can also be done without \times or \scaleDurations in a
"semantically correct" way (assuming that the length of a quarter note
should remain unchanged):
\version "2.19.80"
\relative {
\time 3/4
a b c
\set Score.measureLength = #(ly:make-moment 5 4)
d c d c b
a b c d e
\set Score.measureLength = #(ly:make-moment 3 4)
a b c
d e c
}
Best
Lukas
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