midiinstrument and clefs

[David Raleigh Arnold]

Is there any way to get Staff.midiInstrument to work?

 \context Staff = tone {
  \set Staff.instrument = #"vocal"
  \set Staff.midiInstrument = #"voice oohs"
  \melody
  {

Lilypond 1.32 doesn't complain, but neither does it deliver.  I've
tried a lot of things.  \property is long gone, apparently.

Question 2:

Why does lilypond do small clefs in the middle of a line by default
instead of regular?  Aren't small clefs supposed to be for changing clef
without having to change the key signature, so the whole idea is *not*
to have a new key sig appear?  Isn't that what they're for?  If you
change keys in midstream, so to speak, don't you need a regular clef?
So wouldn't \smallclef make more sense when you want no new key sig to
appear, and \key when you want both clef and key sig?  daveA

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