Success!
I opted for mixing into the DCO1 & DCO2 Pins on the NJM2069 rather than switching from the Noise Input for now as it was easier. When you do this, you should set the DCO level to max, go into Hold mode and press a key, then turn each harmonic of the DCO to 0 for it to work.
I used some stacked saws from the Kurzweil. These are multi-samples and DSP-based Oscs.
Video with the Kurz providing the Oscs and the arpeggiations:
http://www.youtube.com/watch?v=DHGhQdMpXDI With a Kurzweil Solina program and with the Kurz filters turned off, I can get some very interesting Solina/Eminent-type sounds(!), especially when turning the Bucket-Brigade Chorus on, which is to be expected.
Next, as the DCO1 input got unsoldered again, I'll work on that and with a new cable, will try the Kurz sending to both inputs simultaneously.
After that, I will try to set up some judicious routing so that he raw Kurz Oscs go to the Korg Poly-800 for filtering, then the output of the Korg will go straight back into the Kurzweil for processing with the KDFX Digital multi-effects.
This is going to be amazing.
With the Noise Pin Audio In, I could also add another Osc input, giving me three different inputs into the Filter.