transposition and midi

[D Josiah Boothby]

Thank you for showing me that there are two sections on transposing, 
Mats, but now I have a new question:

In a recent email to the list, I saw that to remove a key signature, I 
could just use \override KeySignature #'transparent to do the job. 
Unfortunately, when I do this to a transposed part (as shown below), the 
transposition is nullified, so the notes are printed to the original pitch.

-Josiah

\version "2.4.2"

clarinetNotes = \relative c'' {
 \transposition bes
 \key d \minor
 d4 e f2
}

hornNotes = \relative c'' {
 \transposition es % original transposition
 \key a \minor
 c4 d8 f e4 c
}

\score {

 \context StaffGroup <<
   \context Staff = "clarinet" <<
     \clarinetNotes
   >>

   \context Staff = "horn" <<
     \transposition f
     \transpose c bes, % transposes horn in Es to horn in F
     \override KeySignature #'transparent = ##t % since hornists hate 
key sigs
     \hornNotes
   >>

 >>

 \midi { \tempo 4 = 60 }

 \layout { raggedright = ##t }
}

Mats Bengtsson wrote:

> The table of contents of the users manual includes two sections
> with titles including "transpose" or "transposition". Make sure
> to read both of them.
>
>    /Mats
>
> D Josiah Boothby wrote:
>
> > Using 2.4.2, I'd like to be able to transpose a part, create a midi 
> > file, and create the graphical output. The midi output is transposed 
> > right along with the score if everything is in the same score block. 
> > Is it possible to have an untransposed midi with transposed parts 
> > without having to play games with comments or writing out more than 
> > one score block every time (as in the below example)?