moving Tie_engraver to Score

[Juergen Ibelgaufts]

Hello everybody,

for some practical reasons I have to split my score into different voices in
different variables, In order to tie two notes across these voices, I learned
from this forum how to move the Tie_engraver from the voice context to the Staff
context which works fine.

My problem is that I have two voices, \voiceOne and \voiceTwo and have them
printed in different colors which works fine inside one voice/variable. But as
it comes to tie notes across these variables, the ties in \voiceOne and
\voiceTwo are considered as one tie, and it is not possible to color them
separately, or to have \voiceOne tied and \voiceTwo not, for example.

I've also tried \laissezvibrer and \repeatTie, but these constructs behave and
look very different.

Now I'm stuck and can't find a solution. Anyone any idea? Thanks in advance
Juergen