Here's where I am so far :
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\version "2.18.2"
aigues = \relative c' {
\time 6/8
s4.
\stemDown
c16[ bes' e]
\stemUp
g c e
\stemDown
g8
}
basses = \relative c {
\time 3/4
\clef F
\omit TupletBracket
\tupletDown
\tweak TupletNumber.extra-offset #'(.5 . 7)
\tweak TupletNumber.whiteout ##t
\tuplet 7/6 {
c16[
-\tweak style #"line"
-\tweak thickness #2
-\tweak bound-details.left #`(
(padding . -1)
(Y . -1.5)
(text . ,(make-draw-line-markup (cons 0 -0.8))))
-\tweak bound-details.right #`(
(padding . -1)
(Y . 1.5)
(text . ,(make-draw-line-markup (cons 0 0.8))))
\startTextSpan bes' e]
\change Staff = md
\stemUp
g[ c e g]
\stopTextSpan
}
s4.s8
}
\new PianoStaff
\with { \omit TimeSignature }
<<
\new Staff = md \aigues
\new Staff = mg \basses
>>
%%%%%%%%%%%%%%%%%%%%%
I cannot find a way to unset the TextSpanner staff-padding .
Any idea ?