Horizontal offset in polyphonic contexts.

[Guy Stalnaker]

All,

Code below produces perplexing results."\once \override 
NoteColumn.X-offset" works in two situations, but not a third, and 
shifts the wrong notes on a fourth. I do not understand why. Why does 
the .X-offset work for ExampleTwo and ExampleFour, but not when set in 
the polyphonic context ExampleCombinedOne? Removing the \new Voice from 
the polyphonic context in ExampleCombinedTwo does result in horizontal 
shifting, but not of the bf', rather the <c'' ef'> chord!

The NoteColumn #'force-shift has no effect in any of these examples 
(though it does work in other parts of my score).

<code>
\version "2.17.3"
\language "english"

%This is from a mailing to the list by Urs Liska

ExampleOne = {
  \time 5/4
  c''2
}

ExampleTwo = {
  \time 5/4
  \clef F
  \stemUp
  r16 a,!
  % This works
  \change Staff = "RH" \once \stemDown \once \override 
NoteColumn.X-offset = #.5 c'! % #10 % or #-1 in your case
  % This does not work
  %    \change Staff = "RH" \once \stemDown \once \override NoteColumn 
#'force-hshift = #-5.5 c'! % #10 % or #-1 in your case
  \change Staff = "LH" b! s4
}

ExampleOnePart = \new Staff = "RH"
\with { \omit Clef }
{ \ExampleOne }


ExampleTwoPart = \new Staff ="LH"
\with { \omit Clef }
{ \ExampleTwo }

\score {
  <<
    \ExampleOnePart
    \ExampleTwoPart
  >>
}

% This is my music. I'm trying to shift the bf' to the right so it's not 
on top of the <c'' ef'> chord.

ExampleThree = {
  \time 6/4
  <g'' d'' bf'>2 <f'' c'' a'>4 <ef'' bf' g'>2 <d'' bf' f'>4 |
  <c'' ef'>2. <d'' b' g' d'>  |
}

ExampleFour = {
  \time 6/4
  s1. |
  % This does not work. Why?
  \stemUp \once \override NoteColumn.X-offset = #1.5 bf'2 af'4 s2. |
    % The following DOES work at two other spots in the score I'm creating,
  % in polyphonic contexts, but not here.
  % It DOES NOT work in Urs Liska's example above.
  %\stemUp \once \override NoteColumn #'force-hshift = #1.5 bf'2 af'4 s2. |
}

ExampleCombinedOne = {
  << { \voiceOne \ExampleThree
     }
     \new Voice {
       \voiceTwo {
         \ExampleFour
       }
     }
  >>
}

ExampleCombinedTwo= {
  << { \voiceOne \ExampleThree
     }
     \voiceTwo { \ExampleFour
     }
  >>
}

ExampleThreePart = \new Staff
\with { \omit Clef }
{ \ExampleThree }

ExampleFourPart = \new Staff
\with { \omit Clef }
{ \ExampleFour }

ExampleCombinedPartOne = \new Staff
\with { \omit Clef }
{ \ExampleCombinedOne }

ExampleCombinedPartTwo = \new Staff
\with { \omit Clef }
{ \ExampleCombinedTwo }

\score {
  <<
    \ExampleThreePart
    \ExampleFourPart % The \override works here
    \ExampleCombinedPartOne % The \override does NOT work here
    \ExampleCombinedPartTwo % The wrong part shifts!
  >>
}

</code>