Re: Strange MIDI output bug

[Erik Sandberg]

On Saturday 18 December 2004 00.24, Mark Cookson wrote:
> I've just installed Lilypond 2.4.2 (running on
> Mandrake Linux 9.2) and have started entering some of
> the Mozart Clarinet Concerto for the mutopia project.
>
> I'm having some trouble getting the midi output to
> come out with the correct transpositions. I've
> condensed the problem into the file at the bottom of
> this email.

Thanks! I reduced it to the following & added it to the bug database.

One strange thing, is that the error is that the _upper_ staff is transposed.

% important
% Mark Cookson <address@hidden>

\header {
  texidoc = "Midi output is sometimes destroyed if \\transposition is used 
inside \\partcombine.

Small random changes can make it work, e.g. commenting out a time signature."
  reportedin = "2.4.2"
}

\version "2.4.2"

One = \relative c'' {
  a4 d4 fis e d
}

Two = \relative c'' {
  \time 3/4 % Uncomment this line and it works as expected.
  \transposition d
  \time 3/4
  g4 c e d c
}

\score {
  <<
    \new Staff \One
    \new Staff << \partcombine \Two \Two >>
  >>
  \midi { \tempo 4=100}
  \layout{}
}



> As written, the midi transpositions come out fairly
> surprising (try it and see!)
> Oddly though, if I comment out all of the lines:
> R2.*8
> then the transposition works fine, although Lilypond
> then prints a warning:
>
> warning: FIXME: key change merge
> (I'm not sure if this means that you're already aware
> of the problem?)
>
> I can also fix the midi output by altering the \score
> block to use four separate staves rather than using
> \partcombine.
>
> Thanks in advance for any light you can shed on the
> problem.
>
> Mark Cookson
> PS Now that I've had some time to get my head around
> the workings of Lilypond, is there anything a fairly
> non-technical user like me can do to help on the
> documentation side of things?
>
>
>
> ***************
>
> \include "english.ly"
> \version "2.4.2"
>
>      global = {
>         \time 3/4
>
>      }
> fluteOne = \relative c''' {
>   \set Staff.midiInstrument = "flute"
>
>   \key d \major
>   \clef treble
>
>   R2.*8
>
>   a2.\f  ~
>   a2.
>   a4.( d8 fs, a)
>   a8( g) fs4 r4
>   e2 ( fs4)
>   e4( a8) cs( b a')
>   a,2 \appoggiatura cs16 b8.( a16)
>   a4 r4 r4
> }
> fluteTwo = \relative c'' {
>   \set Staff.midiInstrument = "flute"
>
>   \key d \major
>   \clef treble
>
>   R2.*8
>
>   a4\f( d4. fs8)
>   fs8( e) d4 r4
>   fs2( d8 fs)
>   e4( d4) r4
>   cs2( d4)
>   cs4.( e8 fs d)
>   cs2 \appoggiatura e16 d8.( cs16)
>   cs4 r4 r4
> }
>
>
> hornOne = \relative c'' {
>   \set Staff.midiInstrument = "french horn"
>   \transposition d
>   \key c \major
>   \clef treble
>
>   R2.*8
>
>   g4\f( c4. e8)
>   e8( d) c4 r4
>   g4.( c8 e g)
>   g8( f) e4 r4
>
>   d2( e4)
>   d2( e4)
>   d2. ~
>   d4 r4 r4
>
> }
>
> hornTwo = \relative c' {
>   \set Staff.midiInstrument = "french horn"
>   \transposition d
>   \key c \major
>   \clef treble
>
>   R2.*8
>
>   e4\f e4.( g8)
>   g4( e4) r4
>   e4.( g8 c e)
>   d4( c4) r4
>   g2( c4)
>   g2( c4)
>   d2.(
>   g,4) r4 r4
>
> }
>
>
>      \score {
>         \new StaffGroup <<
>           \new Staff << \set Staff.instrument =
> "Flutes" \global \partcombine  \fluteOne  \fluteTwo >>
>         \new Staff << \set Staff.instrument = "Horns in D"
> \global \partcombine \hornOne \hornTwo >>
>
>
>         \layout { }
>         \midi { \tempo 4=100}
>      }
>
> ***************
>
>
>
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