Consider the following score:
\new PianoStaff <<
\new Staff = "up" {
<> % this should do nothing...
<<
\new Voice \relative { e''4 f e }
\new Voice \autochange \relative { a'~ a g }
\new Voice \autochange \relative { c'~ c b }
>> }
\new Staff = "down" { \clef F <<
\new Voice \relative { a d, e }
>> }
>>
Problem 1: why, on the third beat, is the alto voice (playing a g')
displayed on the "down" Staff?
Problem 2: delete the line saying "<>" and recompile. Now
all hell breaks loose: the score acquires a third staff, which even
eats the soprano on the third beat...
(on the other hand, the chords on beats 1 and 2 are now nicer).
Why? (I guess that the "up" Staff had a default, empty voice
through the "<>" - is that correct? but it does not explain all).
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