Combining autochange and normal notation

[Helge Kruse]

Hello,

I have a variation of a piece, where the first lines are played single 
voice over two staves and the other lines are normal upper/lower staves. 
To avoid a lot of silent rests I want to use the \autochange in the 
PianoStaff for the first lines and append the other in the same score.

At first I have a problem, to setup the environment for the \autochange 
as described in 2.2.1 (Common notation for keyboards/Changing staff 
automatically). Instead of settng the low staff key I get an additional 
one. Why do I get it and how it's done correct?

Second I want to combine both parts. I tried it as show in the third 
score. This doesnt compile. Therefore I have commented it out. Can you 
show me, how to write both, normal notation and \autochange in one 
score? I would prefer to use the musical expression definitions used in 
\score since these are in \included files.


Thanks,
Helge

\version "2.11.63"

%
% \autochange requires to write all in one line
%
changingStaff = {
\autochange \relative c {
  \clef treble \key as \minor \time 2/4
  as32 ces es as ces es as ces   as,,32 ces es as ces es as ces |
  g,,32 b des fes g b des fes g b des fes g b des fes |
}
}

%
% for horizontal notation define the staves seperately
%
up = \relative c' {
  \clef treble \key as \minor \time 2/4
  r32 es g ces es ces g es  r es g ces es ces g es 
}

low = \relative c {
  \clef bass \key as \minor \time 2/4
  <ces es ges ces>4 r |
}

\book {
  % part 1 using autochange
  \score {
    \new PianoStaff <<
      \new Staff = "up" {
        \new Voice = "melOne" {
          \changingStaff
        }
      }
      \new Staff = "down" {
        \key as \minor \clef bass
      }
      >>
  }

  % part 2 normal piano notation
  \score {
    \context PianoStaff <<
      \new Staff = "upper" \up
      \new Staff = "lower" \low
    >>
    \layout {
    }
  }

  % poth parts in one score
  \score {
    \new PianoStaff <<
      \new Staff = "up" {
        \new Voice = "melOne" {
          \changingStaff
        }
      }
      \new Staff = "down" {
        \key as \minor \clef bass
      }
    >>
    \new PianoStaff <<
      \new Staff = "upper" \up
      \new Staff = "lower" \low
    >>
    }
}