Re: cross-staff "synchronized" grace-note figure

[Neil Puttock]

Hi Eric,

On Sat, Mar 1, 2008 at 5:08 AM, Eric Flesher <address@hidden> wrote:

>  Is it possible in a piano (grand-staff) score to create a grace-note figures
>  such that:
>  1. the figure consists of 4 notes in the bass staff (beamed as small 8th 
> notes)
>  2. the second note of the figure synchronizes with the same pitch on beat 1 
> of
>  the treble staff.
>  3. this second note is cross-staff beamed to the note in the treble staff

It's certainly possible, but there's no easy solution using LilyPond's
built-in grace note support (which is pretty inflexible and awkward
when it comes to spacing).

Here's a snippet using fake grace notes which might be one way of
solving this problem:

\version "2.11.42"

\paper { ragged-right = ##t }

rh = \change Staff = upper
lh = \change Staff = lower

%This macro fakes grace notes from normal notes using the default
grace note settings in engraver-init.ly
graceNotes = #(define-music-function (parser location music) (ly:music?)
#{
        \override Stem #'direction = #UP
        \override Stem #'font-size = #-3
        \override NoteHead #'font-size = #-3
        \override Dots #'font-size = #-3
        \override Stem #'length-fraction = #0.8
        \override Stem #'no-stem-extend = ##t
        \override Beam #'thickness = #0.384
        \override Beam #'length-fraction = #0.8
        \override Accidental #'font-size = #-4
        \override Slur #'direction = #DOWN
        
        $music
        
        \revert Stem #'direction
        \revert Stem #'font-size
        \revert NoteHead #'font-size
        \revert Dots #'font-size
        \revert Stem #'length-fraction
        \revert Stem #'no-stem-extend
        \revert Beam #'thickness
        \revert Beam #'length-fraction
        \revert Accidental #'font-size
        \revert Slur #'direction
#})

upper = {
        \time 3/8
        %a skip for the first grace note in the bass, followed by the main
note with a scaled duration
        s16 dis'4.*5/6 |
}

lower = {
        \clef bass
        %the arabesque faked using the macro and scaled durations
        \graceNotes {
                \voiceTwo d,,8*1/2 \rh
                %hide the small accidental for the merged note
                \once \override Accidental #'stencil = ##f dis' \lh cis, fis g 
} s
}
        

\score {
        \new PianoStaff <<
                \context Staff = upper { \upper }
                \context Staff = lower { \lower }
        >>
        \layout {
                \context { \Score
                        \override NoteCollision #'merge-differently-dotted = ##t
                }
        }
}

Regards,
Neil

arabesque.PNG
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