Hey all, Sibelius 7.0.0 exports wrong duration values for chorded notes in tuplets. The exported value in this example (https://www.dropbox.com/s/vrvdabwym9tezd0/time-modification_and_chorded_notes.xml) is 256 instead of 170 for a quarter note in a triplet of eighths (<divisions>256</divisions>). <durations>170</durations> is not an optimal value for a quarter note in a triplet of eighths as there is a rounding difference (256*2/3=170.6666...). The same holds for an eighth note in a triplet of eighths (128*2/3=85.3333... instead of 86 used here). musicxml2ly does not like rounding errors. The resulting LilyPond-code contains wild scaling durations and a superfluous spacer rest: \times 2/3 { <c'' a'>4*255/256 s512*43 r8*129/128 } r4 r2 }
This is bad because we have a bar check problem here! Sometimes music applications export suboptimal/false values for divisions and durations. A solution: musicxml2ly should recalculate all durations on the basis of a divisions value of 6720. This figure is divisible without remainder by e.g. 2, 3, 4, 5, 6, 7, 8, 16, 32, 64 and therefore can provide for note durations up to 256th. A quarter note (6720) in a triplet of eighths would have a value of 4480 (6720*2/3). An eighth note (6720/2=3360) in a triplet of eighths would have a value of 2240 (3360*2/3). (half note: 6720*2 = 13440.) hth patrick _______________________________________________ bug-lilypond mailing list [email protected] https://lists.gnu.org/mailman/listinfo/bug-lilypond
