Re: osia: hide first bar line on left hand of key signature

[Konstatin Heuer]

> 
In case someone is ever interested in this issue again, 
I will post my final solution, 
that I found with your help.

I think it is the simplest way to synchronize scores 
with any kind of systemStartDelimiter 
and without connection by a primary bar line.

\score{
\layout {\context {\Score \remove System_start_delimiter_engraver }}
\new StaffGroup
\with { systemStartDelimiter = #'SystemStartBar }
        <<{f'1f'}
        \new StaffGroup
                <<
                \new GrandStaff
                        <<
                        {e'e'}
                        {d'd'}
                        >>
                {c'c'}
                >>
        >>
>>
\new StaffGroup
\with { systemStartDelimiter = #'SystemStartBar }
        <<{f'f'}
        \new StaffGroup
                <<
                \new GrandStaff
                        <<
                        {e'e'}
                        {d'd'}
                        >>
                {c'c'}
                >>
        >>
>>
}