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

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Issue 645: midiInstrument + \transposition + \partcombine = wrong MIDI output
http://code.google.com/p/lilypond/issues/detail?id=645

New issue report by v.villenave:
% Here's a weird one...

\version "2.11.50"

untransposed = \relative c'' {
 c4 c d d
}

transposed = \relative c'' {
 % Setting the midiInstrument BEFORE the \transposition
 % causes the part above to be transposed
 % in the MIDI output (but not in the PDF output)

 %\transposition bes

 \set Staff.midiInstrument = "trumpet"

 % Comment this line and uncomment the above one to resolve the bug.
 \transposition bes
 R1
}

\score {
 <<
   \new Staff \untransposed
   \new Staff \partcombine \transposed \transposed
 >>
 \layout{ }
 \midi{ }
}


Issue attributes:
        Status: Accepted
        Owner: v.villenave
        Labels: Type-Defect Priority-Low MIDI

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