Yamaha GX-1

[riccardo]

Hi,
I know we're not too many having one of these.
The problem with these, are the encapsulated circuits (vco, vcf, eg) on the
voice boards.
I know for sure they are made with discrete components, no integrated circuits.
Of course nobody at Yamaha still have the original project or is authorized to
give, sell ........
Anybody out there with a good idea on how to duplicate the items?
Or please let me know who I can ask for (no Yamaha people, they have been
kind enough to give me some spare parts, but somebody who serviced the
beasts).
thks
riccardo

P.S. this is another of the repeating help needed message I sent on the GX-1.
     it is only here to remind you that help is still needed!!!!!