Hi,
from the other replies I conclude that the Voice has no midiInstrument
and one cannot change the instrument inside the staff.
Or do you mean 'set' (once for the whole piece) by 'change'?
In both cases, if you want different instruments within the same staff,
you could make a separate midi score using the same music variables
which has more staves. Like (pseudocode):
\score { % for pdf
staff << { voice1a voice1b } voice2 >>
}
\score { % for midi
<<
staff { voice1a } with midiInstrument = flute
staff { s1*n voice1b } with midiInstrument = accordion
staff { voice2 } with midiInstrument = guitar
>>
}
HTH,
Joram
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