MIDI voice not piano

[dadadharma @dslextreme.com]

Dear Frogs, Mosquitos, and Algae,

What am I doing wrong here?

Although I specify "choir aahs"  and "voice oohs" ,

I only get the default Grand Piano.

David Olson

================================


\score {
   <<
           \new Staff = "one" { \sopranoMusic
      \set Staff.midiInstrument = #"choir aahs" }
           \new Staff = "two" { \altoMusic
      \set Staff.midiInstrument = #"voice oohs" }

   >>
  \layout{}

  \midi{
         \context {
      \Staff
      \consists "Staff_performer"
    }

    {
        \tempo 2 = 30
          }
}

voice_not_piano.ly
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