\change Staff don't work fine

[Mario Moles]

Any idea? Thank's!
\version "2.15.10"
csr = \change Staff = "right"
csl = \change Staff = "left" 
sn=\stemNeutral
su=\stemUp
sd=\stemDown
tn=\tieNeutral
suon = \sustainOn
suof = \sustainOff
tempoMark = {
  \once \override Score.RehearsalMark #'self-alignment-X = #LEFT
  \once \override Score.RehearsalMark #'break-align-symbols = #'(time-
signature key-signature)
  \once \override Staff.TimeSignature #'break-align-anchor-alignment = #LEFT
  \mark \markup \bold {
    "Allegro molto"
    }
}

global = {
  \tempoMark
  \key g \major
  \time 6/8
}
rightOne = \relative c' {
  \global
  % Qui segue la musica.
  \global
  \override Fingering #'avoid-slur = #'inside
  % Qui segue la musica.
  \csl c8\pp \csr g' c, \csl b \csr g' c,|
  \csl c \csr g' c, \csl g \csr g' c,|
  \csl c \csr g' c, \csl b \csr g' c,|
  \csl c \csr g' c, \csl g \csr g' c,|
  \csl c \csr g' c, \csl b \csr g' c,|
  \csl c \csr g' c, \csl g \csr g' c,|  
  \csl e \csr b' e, \csl d \csr b' e,|
  \csl e \csr b' e, \csl b \csr b' e,|
  \csl e \csr b' e, \csl d \csr b' e,|
  \csl e \csr b' e, \csl b \csr b' e,|
  \csl g \csr d' g, \csl fis \csr d' g,|
  \csl g \csr d' g, \csl d \csr d' g,|
  \csl g \csr d' g, \csl fis \csr d' g,|
  \csl c, \csr g' c, \csl b \csr g' c,|
  \csl c \csr g' c, \csl g \csr g' c,|
  \csl c \csr g' c, \csl b \csr g' c,|
  \csl c \csr g' c, \csl b \csr g' c,|
  \csl b \csr fis' b, \csl a \csr fis' b,|
  \csl b \csr fis' b, \csl a \csr fis' b,|
  \csl a \csr e' a, \csl g \csr e' a,|
  \csl a \csr e' a, \csl g \csr e' a,|
  \clef "bass"
  \repeat unfold 4
  {\csl \su g \csr \sd d' g, \csl \su fis \csr \sd d' g,|}
  \repeat unfold 2
  {\csl \su fis \csr \sd cis' fis, \csl \su e \csr \sd cis' fis,|}
  \repeat unfold 2
  {\csl \su e \csr \sd b' e, \csl \su d \csr \sd b' e,|}
  \repeat unfold 2
  {\csl \su d \csr \sd a' d, \csl \su c \csr \sd a' d,|}
  \repeat unfold 2
  {\csl \su c \csr \sd g' c, \csl \su a \csr \sd g' c,|}
  \csl \su g \csr \sd g' c, \csl \su fis, \csr \sd g' c,|
  \csl \su e,2.|
  \csr
  \repeat unfold 4 {r2.}|
  \time 2/4
  \repeat unfold 21{r2}|
  \clef "treble"
  \time 6/8
  e'''4 d8 c4 d8|
  
}

rightTwo = \relative c' {
  \global
  % Qui segue la musica.
  s2.*39|
  s2*21|
  <g, b>2.|  
}

leftOne = \relative c' {
  \global
  % Qui segue la musica.
  s2.*39|
%   s2*21|
  \csl
%   c,8 g' c b, g' c|    
}

leftTwo = \relative c {
  \global
  % Qui segue la musica.
  c'4.\suon b|
  c g|
  c b|
  c g|
  c b|
  c g|
  e' d|
  e b|
  e d|
  e b|
  \clef "treble"
  g' fis|
  g d|
  g fis|
  \clef "bass"
  c b|
  c g|
  c b|
  c b|
  b a|
  b a|
  a g|
  a g|
  g fis|
  g fis|
  g fis|
  g fis|
  fis e|
  fis e|
  e d|
  e d|
  d c|
  d c|
  c b|
  c a|
  g fis|
  s2.|
  \repeat unfold 4 {r2.}|
  \repeat unfold 21{r2}|
  \clef "bass"
  c'4. b|  
}

\score {
  \new PianoStaff \with {
    instrumentName = "Pf."
  } <<
    \new Staff = "right" \with {
      midiInstrument = "acoustic grand"
    } << \rightOne \\ \rightTwo >>
    \new Staff = "left" \with {
      midiInstrument = "acoustic grand"
    } { \clef bass << \leftOne \\ \leftTwo >> }
  >>
  \layout { }
  \midi {
    \context {
      \Score
      tempoWholesPerMinute = #(ly:make-moment 100 4)
    }
  }
}

-- 
oiram/bin/selom

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