Orchestra MIDI

[Will Oram]

I'm working on a rerendition of the Fidelio Overture. As it's my first 
work with orchestral scores, I'm doing a few test lines using only Oboe 
and Flute.

The output renders fine, but the MIDI only plays the Oboe part. There's 
no diff between the two parts, particularly because all the MIDI 
commands occur in the centre file.

This is the entirety of the main file. (Except for the many many 
instruments I commented out until I finish the Flute/Oboe lines.)

\include "flauti.ly"
\include "oboi.ly"

\score {
  <<
    \context StaffGroup ="woodwinds" <<
      \context Staff ="flauti" <<
        \property Score.MetronomeMark \override #'transparent = ##t
        \property Staff.midiInstrument = #"flute"
                \property Staff.instrument = \markup { \center < "2 Flauti" > }
                \theFlutes
                >>

      \context Staff ="oboi" <<
        \property Staff.midiInstrument = #"oboe"
        \property Staff.instrument = \markup { \center < "2 Oboi" > }
        \theOboes
        >>
  >>

\midi { \tempo 4 = 280 }
  \paper {
        \paperSixteen
    \translator {
      \RemoveEmptyStaffContext
    }
    \translator {
      \OrchestralScoreContext
    }
  }
}

Thanks.

Will Oram
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