Thanks a lot for your help! 

Moving the Midi_control_change_performer did the trick (I was unaware of its 
existence).

A MWA that actually works is then:

\version "2.19.82"
\score {
  \new Staff <<
    \new Voice \relative c''' {
      \set midiExpression = #.1
      \voiceOne
      g1
      \set midiExpression = #.4
      e
    }
    \new Voice \relative c'' {
      \voiceTwo
      b1 c
    } >>
  \layout { }
  \midi {
    \context {
      \Staff
      \remove "Staff_performer"
      \remove "Midi_control_change_performer"
    }
    \context {
      \Voice
      \consists "Staff_performer"
      \consists "Midi_control_change_performer"
    }
  }
}



> 17 apr. 2019 kl. 09:01 skrev Heikki Tauriainen <[email protected]>:
> 
> On Mon, 2019-04-15 at 23:36 +0200, Leo Correia de Verdier wrote:
>> Dear list! 
>> 
>> Can any of you check this for possible mistakes so I can rule out
>> myself as source of error before I send it in as a bug report?
>> 
>> Love
>> /Leo
> 
> To make the changes to the MIDI expression level have effect, you'll
> probably need to move also the Midi_control_change_performer from the
> Staff context to the Voice context.
> 
> -- 
> Heikki Tauriainen
> 
> 
> 
> _______________________________________________
> lilypond-user mailing list
> [email protected]
> https://lists.gnu.org/mailman/listinfo/lilypond-user


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