Elektor Formant Modular

Hi,

I'm currently pulling in all the components I needed for my Formant
MSS2000 to be built. Doing Ok so far.

Where does the 12v and 5v supply for the vco come from, Does IC4, and
IC7 produce this? As I'm controlling my synth via a digital interface
in the shape of a midijack I need only provid a board with a CV and
Gate out which I planned to create with a couple of voltage followers
and from there input these into the BUS system and use 3.5mm sockets
on the bus access module to provide CV and gate outputs.

My real problem is will the VCO's run with just the normal +15 and -15
v  inputs as specified and create the relative voltages or do you need
more supply voltages. (I think it looks as if they are created on the
VCO boards)

I need to know as soon as possible as if I need to I will have to
create an interface board.

Cheers
Kris Bishop