Are you sure it's a stage CS-327? I googled them and the 327 looks like a standard strat-copy (5-way selector and 3 single coils), did see some pictures of another model with a bridge humbucker, two singles, two switches and three pots. It's possible someone has customised it if you've got it second hand. Typically two pickups would mean a three-way switch, maybe the intention was to have a separate toggle for each pickup?
I'll post this link http://www.seymourduncan.com/support/wiring-diagrams/
but it looks like an odd enough setup that I don't think you'll find anything directly applicable there. You can see how the tone and volume should work though.
If you didn't want to do a separate toggle for each pickup you could swap one of the dpdt switches (I'm assuming that's what they are) for a three way switch and then use the other switch for ... something. Maybe series/parallel, phase, or coil split if the pickups have the necessary wires.