Re: grace-note spacing and triplets

[Simon Albrecht]

Hi Jan-Peter,

On 22.03.2016 15:10, Jan-Peter Voigt wrote:
> Hi all,
>
> I have a problem spacing grace notes under a series of triplets. In 
> the example, the grace notes produce a big gap between the tuplets or 
> collide with the accidentals.

It’s an annoying bug that this isn’t handled nicely, and there is no 
nice workaround either. I could only concoct the following hack:

%%%%%%%%%%%
\version "2.19.38"

pseudograce =
#(define-music-function (parser location music) (ly:music?)
   #{
     \tiny
     \temporary\stemUp
     \temporary\offset length -1 Stem

     $music
     \normalsize
     \revert Stem.direction
     \revert Stem.length
   #})

% triplets played by the flute
flute = \new Staff \with {
  \tupletSpan 8
  beamExceptions = #'((end .
                        (
                          ((1 . 24) . (3 3 3 3 3 3 3 3))
                          )))
} \tuplet 3/2 {
  gis'16( f'' e'') d''( c'' b') a'( gis' fis')
}

% sung words with grace notes
melody = \new Staff \new Voice {
  \autoBeamOff
  d''8*6/10 \pseudograce { c''16*4/5( } bis'8*6/10) \pseudograce 
{a'16(}  gis'8)
} \addlyrics { Je -- su, ach! }

% in this score, the grace notes produce gaps between the tuplets
\score {
  <<
    \flute
    \melody
  >>
}
%%%%%%%%%%%

v2.19.25 is needed because offsetting Stem length only became possible 
through issue 4516. Thanks David!

HTH, Simon