Hi Federico,
How about:
\version "2.19"
upper = \relative {
e'8 cis( b) gis~ gis r b4
% maybe it's the grace synchronization bug?
\break |
\hideNotes \grace b8 r1
}
lower = \relative {
e,2 e'8 r
\once\override Glissando.breakable = ##t
\once\override Glissando.after-line-breaking = ##t
g4\4\glissando
% start glissando which will continue on a previous bar
|\break
\hideNotes \grace gis8\4 \unHideNotes
e,2 e'^\fermata |
}
\score {
\new StaffGroup <<
\new Staff { \clef "treble_8" << \voiceOne \upper \\ \voiceTwo \lower >> }
\new TabStaff \with {
stringTunings = #guitar-tuning
\clef moderntab
} <<
\new TabVoice { \voiceOne \upper }
\new TabVoice { \voiceTwo \lower }
>>
>>
}
HTH.