The use of autochange for a single, automatically created voice is
well-document here:
http://www.lilypond.org/doc/v2.15/Documentation/notation/common-notation-for-keyboards#changing-staff-automatically
A user recently found it quite hard to figure out how to do this properly for a
situation with multiple voices:
http://lists.gnu.org/archive/html/bug-lilypond/2012-06/msg00029.html
I'd like to suggest enhancing the documentation with a Snippet showing how to
use autochange with two voices.
Please add the Snippet to this section:
http://www.lilypond.org/doc/v2.15/Documentation/snippets-big-page#keyboards
Please add a link from the autochange documentation
http://www.lilypond.org/doc/v2.15/Documentation/notation/common-notation-for-keyboards#changing-staff-automatically
Cheers,
Colin Hall.
--
Colin Hall
\version "2.14.2"
\score
{
\new PianoStaff
<<
\new Staff = "up"
{
\key des \major
\time 7/8
\clef treble
\set Timing.beatStructure = #'(7)
<<
\new Voice
{
\voiceOne
\autochange
\relative c'
{
\stemUp
{
\bar "|:"
ges8 aes bes c des ees f |
\bar ":|"
\cadenzaOn ges1 \cadenzaOff |
\bar "|."
}
}
}
\new Voice
{
\key des \major
\autochange
{
\relative c'
{
\stemDown
{
ges8 aes bes c des ees f |
\cadenzaOn ges1 \cadenzaOff
}
}
}
}
>>
}
\new Staff = "down"
{
\key des \major
\clef bass
}
>>
\header
{
subtitle = ##f
subsubtitle = ##f
piece = \markup{ Two voices with the same notes, the R.H. has stems up and
the L.H. has stems down}
}
}
\score
{
\new PianoStaff
<<
\new Staff = "up"
{
\key des \major
\time 7/8
\clef treble
\set Timing.beatStructure = #'(7)
<<
\new Voice
{
\voiceOne
\autochange
\relative c'
{
\stemUp
{
\bar "|:"
ges8 aes bes c des ees f |
\bar
":|" \cadenzaOn ges1 \cadenzaOff \bar "|."
}
}
}
\new Voice
{
\voiceTwo
\autochange
\relative c
{
\stemDown
{
ges8 aes bes c des ees f |
\cadenzaOn ges1 \cadenzaOff
}
}
}
>>
}
\new Staff = "down"
{
\key des \major
\clef bass
}
>>
}
\header
{
subtitle = ##f
subsubtitle = ##f
piece =
\markup
{
\column
{
\justify
{
Two voices with notes an octave apart. Now the noteheads are distinct
and each voice
has a single beam connecting all notes in that voice, even when
autochange puts the notes into the lower stave.
}
}
}
}
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