Creating a 11-line system

[Ståle Ødegården]

Hi!

I wonder how I can create a 11-line system with both treble and bass clefs 
present.

I have two ideas, but I can’t make any of them work:
- Create a PianoStaff or ChoirStaff and force the spacing between them to be 
_excactly_ one line apart - then add the extra line
- Create lots of extra lines in a single staff and set up the two clefs to 
mimic a PianoStaff

What could be the best solution to this problem?



Regards,
Ståle Ødegården