Hello Jacques, Frescobaldi does not always know the latest Lilypond language. As far as I see \compressMMRests and \comressEmptyMeasures do the same, but \compressEmptyMeasures works like a toggle that needs to be unset by \expandEmptyMeasures (it’s basically just a shorthand for \set Score.skipBars = ##t, while \compressMMRests should compress only the following Rest, so it checks if the music is a MM Rest and only then sets Score.skipBars = ##t once.
So if you want to compress every MM Rest over a passage you use \compressEmptyMeasures, if you want to compress one particular MM Rest you use \compressMMRests, I guess. Cheers, Valentin
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