Am 04.04.19 um 10:23 schrieb Gianmaria Lari:
I don't understand how lilypond manages the stem direction in the
following code. Why the difference in the two scores?
\partCombine is for combining a first and a second (or upper and lower)
part in a score, like flute 1 & flute 2 or soprano & alto. As long as
the first/upper part has the higher notes, LilyPond will print simple
chords. When the parts cross (first/upper part has the lower notes),
this will be shown as two different voices so that the stem directions
show the non-standard order of voices.
If you want two separate voices in both cases, you can use
\partCombineApart or instead of \partCombine just << \\ >>.
If you want chords in both cases, you can use \partCombineChords or
instead of \partCombine just << >> without \\.
%%%%%%%%%%%%%%%%%
\version "2.21.0"
upper = { c' d' e' f' }
lower = { a b c' d' }
\partCombine \upper \lower
\partCombine \lower \upper
\partCombine { \partCombineApart \upper } \lower
\partCombine { \partCombineChords \lower } \upper
<< \upper \\ \lower >>
\new Voice << \upper \lower >>
%%%%%%%%%%%%%%%%%
N.B. If someone wants to try this at home be aware that in 2.19.83 and
earlier versions it has to be \partcombine, \partcombineApart,
\partcombineChords (with lowercase c in “combine”).
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