Issue 1661 in lilypond: MIDI dynamics take effect one note too late

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Medium

New issue 1661 by address@hidden: MIDI dynamics take effect one note  
too late
http://code.google.com/p/lilypond/issues/detail?id=1661

Extracted form the report
http://lists.gnu.org/archive/html/bug-lilypond/2011-05/msg00238.html

% MIDI dynamics take effect one-note-late, if they are in a separate voice
% Below, we expect each measure to sound the same
\score {
  \new Staff  <<
      { c'2\ffff  d'\ppp  | c' d' }
      { s1 | s2\ffff s2\ppp }
    >>
  \layout {}
  \midi {}
}
% This option does not affect the bug:
% \set Score.midiChannelMapping = #'staff

The MIDI output from version 2.12 was not completely correct, either (the  
notes change volume a millisecond after the attack) so I have not marked  
this as a regression.

Also, Dynamic_performer is part of Voice context in 2.12.3.  From the name  
alone, I would suppose that Dynamic_performer implements dyanmics,  
independently for each Voice, so this example may have worked accidentally  
in 2.12.3.

Attachments:
        1661.png  7.0 KB
        1661_2_13_61.midi  169 bytes
        1661_2_12.midi  173 bytes