I have tried moving the Tie_engraver from Voice to Staff, in order to
typeset music with cross-voice ties.
(The music doesn't really do that, but lilypond need it this way. The
piece has a cross-staff beam, and all the notes are tied to a
cross-staff chord that follows. And lilypond can only do cross-staff
chords with two voices, while the cross-staff beam must be a single
voice. So some notes must then tie from one voice to another, and
moving the Tie_engraver to Staff accomplish this nicely. Moving the
Tie_performer in a similiar way even achieves correct MIDI for this
construct.)
Unfortunately, this move also gives me a lot of unwanted ties. When one
voice starts a tie at some point in time, then every other voice who has
a note starting at the same time also gets a tie! That is wrong and
unwanted. It is as if the Tie_engraver merely notices that a tie start
at some point in time, and don't understand that tieing shouldn't apply
to *all* notes that start at that point.
The Tie_engraver is already capable of not tieing all notes in a chord,
so I hope this is fixable.
A minimal 4-note example is attached. Two are tied, the other two are
not. But lilypond ties all.
Helge Hafting
\version "2.13.60"
music = \relative c'' { << {c2~ c2} \\ {g2 g2} >>}
\score {
\music
\layout {
\context { \Voice \remove "Tie_engraver" }
\context { \Staff \consists "Tie_engraver" }
}
}
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