5 Beams can be typeset over fixed distance aligned staves, beam
6 beautification doesn't really work, but knees do. Beams should be
7 behave well, wherever the switching point is.
12 \context Staff
=one
\notes\relative c'{
13 \stemUp c8[ c \translator Staff
=two
\stemUp c c]
16 \stemDown c8[ c \translator Staff
=two
\stemUp c c]
18 \stemDown c8[ c \translator Staff
=one
\stemDown c c]
21 \stemUp c8[ c \translator Staff
=one
\stemDown c c]
24 \context Staff
=two
\notes\relative c'{