Re: Hard-to-engrave bits involving polyphony

[Gilles THIBAULT]

> \relative c'' {
>    << { f8 e ~ <c e> <c e> } \\
>       { c4 s4 } >>
> }
>
> [...] I need an
> arpeggio to the left of the first notes (the c and the f).  How can I
> accomplish this?

The problem with the arpeggio in 2 separate voices, has just been resolved 
in the french list yesterday !
And a LSR  has been added (search : "arpeggio").

You can try something like that

%%%%%%%%%%%%%%%%%%%%%%
\version "2.10.20"

\new Staff
\with {
         \consists Span_arpeggio_engraver
 }
\relative c'' {
      \set Staff.connectArpeggios = ##t
     <<
             { f8\arpeggio e ~ <c e> <c e> }
          \\
              { c4\arpeggio s4 } >>
 }

%%%%%%%%%%%%%%%%%%%%%%

For the other problems I have no solutions.
Sorry.

Gilles