Re: [Lilypond-auto] Issue 645 in lilypond: \transposition + \partcombine = wrong MIDI output

[lilypond]

Comment #11 on issue 645 by address@hidden: \transposition +  
\partcombine = wrong MIDI output
http://code.google.com/p/lilypond/issues/detail?id=645

Removing the read of instrumentTransposition in part-combiner.scm:228 does  
remove the problem, and seems to have no ill effects.  I cannot follow the  
data flow to see where the instrumentTranspostion was used (if anywhere) by  
the part combiner.

(If the intent was to *prevent* two horns using one music stand from being  
set "a2" while they were playing different transpositions, then the attempt  
failed.
\new Staff {\clef bass \partcombine {g2 \transposition f c} {c  
\transposition c c}}
shows the two written Cs as unison.)

I would remove the line if I could unravel the Scheme data structures  
enough to close the hole in the data structure.

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