Discussion about the Korg PolySix synthesizer

Hi all,

i have a few questions. Does anyone know how the ABC-Lines for the 
4051\ufffds located on KLM-370 are coded (Inhibit 0/1, Line A/B/C = Knob ?)

2nd question is Connector CN10, how is it driven? Is it a pure 
Key-Matrix-Driver?

3rd quesion is CN05 and CN03, are the driving Voltages pure +5 and -5 Volts?

Thanks

Stef