Issue 1636 in lilypond: midiVolume 0.0 not respected

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Critical Regression

New issue 1636 by address@hidden: midiVolume 0.0 not respected
http://code.google.com/p/lilypond/issues/detail?id=1636

Setting midi volume to 0.0 for some instruments is very useful for  
proofreading (proof-listening) scores.  With the current mixed  
implementation of dynamics as part MIDI velocity, part MIDI volume, the net  
effect of volume 0.0 should be silence, but it is not.

Fortunately, the workaround is very easy: 0.001.  (I intend to mention the  
workaround in CHANGES soon, in hopes of making thus not-release-blocking;  
that mention can be deleted if the bug can be fixed.)

--8<--
\version "2.13.60"  % 2.12.3 and 2.13.48 work
%{ midiM*Volume not respected if volume is 0.0
   Below, dynamics are not essential, but helpful for reading the MIDI file.
%}
\score {
  {
    g'4\fff g'4\ppp
    \set Staff.midiMinimumVolume = #0.0
    \set Staff.midiMaximumVolume = #0.0 % workaround: #0.0001
    g'4\fff g'4\ppp
  }
  \midi { }
}