Discussion about the Korg PolySix synthesizer

I got one board with my Polysix, but theres five sockets without ICs (four big and one small) and I don't know what to do with the cables (there's a lot). I tried to find something about it on the internet, but it seems that there's only info about the other kits. This one has the letters 'KORG USA' printed in the board. Does anybody knows where to find the schemes for this kit or have it installed in his/her Polysix and can help me with this?. Thank you in advance.