Re: MIDI voice not piano

[Federico Bruni]

Il 14/12/2012 00:06, dadadharma @dslextreme.com ha scritto:
> What am I doing wrong here?
>
> Although I specify "choir aahs"  and "voice oohs" ,
>
> I only get the default Grand Piano.

Have you checked this page?
http://lilypond.org/doc/v2.17/Documentation/notation/midi-instruments

You have inserted the notes before changing instrument so obviously it 
can't work.
Call the variable containing the notes after \set, like this:

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

   >>
  \layout{}

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

        \tempo 2 = 30
          }
}

--
Federico