1. The R rests are misplaced (too high in the upper, too low in the lower
staff).
2. If you comment out \key c\major (which does nothing), you get the following
warning:
warning: Change_iterator::process (): Staff = `up':
/tmp/bee/piano.ly:6:21: warning: can't change `Staff' to `down': I'm one
myself:
\change Staff=dow
n \voiceOne c1 \change Staff=up \oneVoice c R
..and the staff change is not done.
The code:
\version "2.1.34"
\score { \context PianoStaff <<
\context Staff=up \notes \relative c' {
\key c\major
\change Staff=down \voiceOne c1 \change Staff=up \oneVoice c R
}
\context Staff=down \notes \relative c'' {
\voiceTwo c1 \oneVoice R c
}
>>
\paper{}
}
erik
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