Many thanks to the lilypond-user group for their advice on measure #47 of the Chopin Nocturne #3 (Op 9 No 3). Urs' article on voices was particularly helpful.
My next challenge appeared in measure #69. This is working for me :
\version "2.16.0"
\relative c'
{ \clef treble
\time 6/8
\key b \major
ais'4.\p \once \override Slur #'stencil = ##f \appoggiatura {b8[\( ais gisis ais]}
<<
{dis4 b8}
\new Voice
{\stemUp
\once \override TupletBracket #'bracket-visibility = ##f
\once \override TupletNumber #'stencil = ##f
\times 1/2
{dis8 \teeny d cis c}
\normalsize b8}
>>
\oneVoice
ais4 gis8\)
}
At first I assumed that both tuplets were appoggiatura, but I couldn't get that to work. I also tried cue notes, but merging the head of
a cue note with a full-size note head was no good either. So my final version (above) treats the first tuplet as an appoggiatura, but the second is a new voice in a smaller font.
I'm delighted with the results. But I do wonder if anyone in the group thinks I may have missed a better approach?
--John
K