A question regarding staff crossing

[Amelie Zapf]

Dear Lilypond folks,

after a long period of "not having any questions" and happily using 2.0, I've 
now upgraded to 2.6.5, due to Linux distribution upgrade. Now here's what I'd 
like to do:

I have a score with the format attached below. Now I would like to use manual 
staff switches in the piano, while still keeping layout and content nicely 
separated, i.e. I'd like to retain the four piano voices as separate units, 
but each one in one piece, and insert them into the PianoStaff later on. Is 
there any way to do that?

Regards,

Amy

%%% The Score

#(set-default-paper-size "a4")
#(set-global-staff-size 16)
\include "english.ly"
%%%%%%%%%%%% Keys'n'thangs %%%%%%%%%%%%%%%%%   
global = { \time 4/4 }
Key = { \key c \major }

% ############ Chords ###########

harmony = \chordmode { \jzchords c1 }
     
% ############ VOICES ############

voc = \relative c' { \Key c1}
text = \lyricmode { note }
    
flt = \relative c'' { \Key }

rhUpper = \relative c''' { \voiceOne \Key c1 }
rhLower = \relative c'' { \voiceTwo \Key c1 }
lhUpper = \relative c' { \voiceOne \Key c1 \change Staff = up c'1 }
lhLower = \relative c' { \voiceTwo \Key c1 }
    
Bass = \transpose c c' \relative c, { \Key c1 }
drumset = \drummode { bd4 }
     
%%%%%%%%% PRE-PROCESSING THE VOICES %%%%%%%%%%%%%%%%%%%%%%

%% ----- Chords -----

rsharmony = \harmony
% tenorharmony = \transpose c' d \harmony

%% ----- Instruments -----

vocal = {
  \global
  \set Staff.instrument = #"Mezzo-Soprano"
  \set Staff.instr = #"msop"
  \set Staff.midiInstrument = "violin"
  \clef treble
  \context Voice = theVoice \voc
}

flute = {
  \global
  \set Staff.instrument = #"Flute"
  \set Staff.instr = #"fl"
  \set Staff.midiInstrument = "flute"
  \clef treble
  \context Staff \flt
}

piano = {
  \context PianoStaff <<
    \set PianoStaff.instrument = #"Piano   "
    \set PianoStaff.instr = #"p   "
    \context Staff = up {   
      \clef treble
      \global
      \set Staff.midiInstrument = "acoustic grand"
      << \new Voice \rhUpper \new Voice \rhLower >>
    }
    \context Staff = down {
      \clef bass
      \global
      \set Staff.midiInstrument = "acoustic grand"
      << \new Voice \lhUpper \new Voice \lhLower >>
    }
  >>
}

bass = {
  \global
  \set Staff.instrument = #"Bass"
  \set Staff.instr = #"b"
  \set Staff.midiInstrument = "contrabass"
  \clef bass
  \context Staff \Bass
}

drumContents = {
  \global
  <<
    \set DrumStaff.instrument = #"Drums"
    \set DrumStaff.instr = #"dr"
    \new DrumVoice \drumset
  >>
}
     
%%%%%%%%% It All Goes Together Here %%%%%%%%%%%%%%%%%%%%%%
     
\score {
  <<
    \new Staff \vocal
    \lyricsto "theVoice" \new Lyrics \text
    \new Staff \flute
    \new ChordNames \rsharmony
    \new PianoStaff \piano
    \new Staff \bass
    \new DrumStaff { \drumContents }
  >>
   
  \layout {
    indent = 1.5 \cm
    raggedlast = ##t
    \context { \RemoveEmptyStaffContext }
    \context {
      \Score
      \override BarNumber #'padding = #3
      \override RehearsalMark #'padding = #2
      skipBars = ##t
    }
  }
 
  \midi { \tempo 4 = 80 }
}

\paper {
    % vsize = 29.7 \cm
    % hsize = 21.0 \cm
    linewidth = 17.0 \cm
    topmargin = 2.0 \cm
    bottommargin = 2.0 \cm
    leftmargin = 2.0 \cm
    betweensystempadding = #1
    raggedbottom=##f
    raggedlastbottom=##f
    % systemSeparatorMarkup=\slashSeparator
}

-- 
Amelie Zapf (address@hidden)
Jazz Pianist, Bassist, Composer, Berlin, Germany
Don't forget to check out http://www.ameliezapf.com/

"When the power of love overcomes the love of power, the world will know 
peace." - Jimi Hendrix