Re: Notes in voiceone corrupt voicethree after voice splitting?

[Simon Albrecht]

Am 24.03.2015 um 19:39 schrieb address@hidden:
>    Howdy!
>
>               I have reduced a multivoice structure that is part of a
> composition to a simple five bar example of voice splitting.
> I need 4 voices, and then I need one voice to split.
>
>              Each bar shows a different behaviour depending on the first voice
>
>         bar 1 -   seems ok
>         bar 2 -  seems ok and NoteColumn.force-hshift   works in voicethree
>         bar 3 -  a quarter note on beat 3 in voiceone causes a collision in
> voicethree and NoteColumn.force-hshift doesn't work
>
>         bar 4 - a simple white harmonic in voiceone creates the same
> condition as bar 3
>         bar 5 - use of     Staff.NoteHead.style = #'harmonic-black  in
> voiceone  causes
>                    notes in voicethree to change to black harmonics
>
> http://www.gooeytar.com/projects/test/test.pdf
>
>          Obviously, voiceone is messing with the "new voice" in voice three.
>
>          What is the correct way to do this in LilyPond??
Well, indeed that seems to be a complicated case. However, if you just 
follow the relevant NR section at 
<http://lilypond.org/doc/v2.18/Documentation/notation/multiple-voices#collision-resolution>, 
it all works as expected (see attachment). Careful doc reading helps…

HTH, Simon
>       thanx - steve
>
>
>
>
> \version "2.18.2"
>
> H = \once \override Staff.NoteHead.style = #'harmonic-black
>
> voiceone = \relative c'' {
>      \clef "G_8"
>      \time 4/4
>      \key g \major
>      b4 b2 r4 |
>      b4 b4 r r |
>      b4 b b b |
>      b4 b b\harmonic b |
>      b4 b \H b b |
> }
>
> voicetwo = \relative c {
>      \set harmonicDots = ##t
>      e'8\rest d2..\harmonic |
>      e8\rest d2..\harmonic |
>      e8\rest d2..\harmonic |
>      e8\rest d2..\harmonic |
>      e8\rest d2..\harmonic |
> }
>
> voicethree = \relative c' {
>      <<
>         \new Voice  % needed or voiceone and three are fused
>          {
>          s4 g4^~ g2 | s4 g4^~ g2 |
>          s4 g4^~ g2 | s4 g4^~ g2 | s4 g4^~ g2 |
>         }
>     %   \\
>          \new Voice
>         {
>          \stemDown
>          g4\rest g4 fis2 |
>          g4\rest g4
>          \once \override NoteColumn.force-hshift = #2.0      % to prove it works
> here
>          fis2 |
>          g4\rest g4
>          \once \override NoteColumn.force-hshift = #2.0       %  doesn't work 
> here
>           fis2 |
>          g4\rest g4 fis2 |
>          g4\rest g4 fis2 |
>         }
>      >>
> }
>
> voicefour = \relative c {
>      c1 | c1 | c1 | c1 | c1
> }
>
>   guitar = << \voiceone \\ \voicetwo \\ \voicethree \\ \voicefour >>
>
> #(set-global-staff-size 19)
>
> \score { \new Staff \guitar }
>
>
>
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steve-voices.ly
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