On 25-Feb-05, at 4:00 PM, Gilles wrote:
%-----
\version "2.4.2"

\score {
\relative c'' {
\time 4/4
% a4 b c d |
<< { a2~\startTrillSpan } { s4 s8 s16 s32 s32\stopTrillSpan } >> a8 b c d |
}
}
%-----


produce a very odd-looking output.
While if the previous bar is added in, it works.

If you start a piece with a << {} {} >>, then LilyPond doesn't know if you want
polyphony, or if you want two separate staffs. To specify polyphony, you
need to use \new Voice { ... }


This is discussed somewhere in the tutorial or the beginning of the
notation manual; have a look for it for more info.

Cheers,
- Graham



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