Re: Issue 645 in lilypond: midiInstrument + \transposition + \partcombine = wrong MIDI output

[Keith E OHara]

On Fri, 01 Oct 2010 16:26:17 -0700, <address@hidden> wrote:

>
%  A workaround for issue 645
\version "2.12.3"
flute = {c''1 \cueDuring "horn2" #DOWN {c''}}
hornI = {
  % Begin with horn in C
  c'1
  % Switch to horn in F.
  % For use in parts, especially cue notes,
  %  let transposition affect the default staff.
  \tag #'part \transposition f
  % For use in the score, refer explicitly to the "horn" staff
  %  to avoid changing MIDI transposition of other staves.
  \tag #'score \context Staff="horn" \transposition f
  g'2^"in F" b'2
}
hornII = {
  c'1
  \tag #'part \transposition f
  \tag #'score \context Staff="horn" \transposition f
  g'2^"in F" d'2
}

\score {
  \keepWithTag #'score <<
    \new Staff="flute" \flute
    % Similar horns can share a staff
    \new Staff="horn" \partcombine \hornI \hornII
%{%}>>
  \layout{}
  \midi{}
}

% We must not refer to the "horn" staff when we quote music
%  in places where a "horn" staff might not exist.
%  (Doing so crashes version 2.12.3)
\addQuote "horn2" \keepWithTag #'part \hornII

\score {
  \keepWithTag #'part \flute
}
\score {
  \keepWithTag #'part \hornI
}
\score {
  \keepWithTag #'part \hornII
}