Earlier (see
http://lists.gnu.org/archive/html/bug-lilypond/2007-06/msg00046.html), I
described very ugly output when using partcombine in lilypond .11.21 to
the current day. Parts took no heed of each other and proceeded to
overlap and create a trainwreck.
After a LOT of ripping apart code, I've come up with a reason and an
example.
REASON: Grace notes! When grace notes occupy the same space, it causes a
partcombine meltdown.
Try this. In reading the output, note measure two: a quarter and dotted
half occupy the same beam, and slurring looks plain wrong.
\include "english.ly"
partA = \relative c''' {
\clef "treble"
c2 d\trill \bar "" \grace { c16[( d]) } \bar "|"
cflat2.( c4)
dflat2 r
}
partB = \relative c'' {
\clef "treble"
c d2_\trill \bar "" \grace { c16[( d]) } \bar "|"
eflat4( f8 gflat aflat4 gflat)
f2 r
}
\score {
\new Staff <<
\partcombine
\partA
\partB
>>
\layout {
}
}
learn from Crunchy
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