The pitch to use for \transposition should correspond to the realAfter using \transpose, they are not in concert pitch.
sound heard when a c' written on the staff is played by the
transposing instrument. This pitch is entered in absolute mode, so an
instrument that produces a real sound which is one tone higher than
the printed music should use \transposition d'. \transposition should
only be used if the pitches are not being entered in concert pitch.
"transposition" is not a verb. And it describes the relation betweenprinted pitch and Midi pitch without necessarily referring to aninstrument.
BTW, it could be better named as something like
\transposingInstrument, it seems.
Would be more explicit: transposition can be understood as the act of
That wasn’t clear to me from the doc.
\context Voice = "Part_POne_Staff_One_Voice_One" <<
\transpose a c' % <<<<<<========= HERE
Thanks David, that solves my problem!