the system software was multi-processor aware in the case of the AV Quadras

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It was? Are you suggesting that any app which can access the onboard AV-Quadra's DSP can transparently access DSPs on a Nubus card?

such a machine could simultaneously use all the dsp cards you can pop in.

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For audio work?

The reason I am looking for specific confirmation here (ie, beyond "I think") is that all the research I have done (admittedly, which was a while back now) indicated that there were no drivers or apps which could use a card created for PShop/QT as an audio DSP - and that the abstraction layers between the OS, Nubus and DSP cards essentially made this impossible without a card specific driver.

See for comparison:

http://en.wikipedia.org/wiki/A/ROSE

This is one of those situations where I would be delighted to be proven wrong!

Don't recall if DECK II uses just built in DSP chips or ones on add-on cards.

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It can use the 56001 on the AudioMedia/AMII card for real-time effects on output, and compression/limiting/EQ on input while recording. It may be able to use other Digidesign/ProTools DSP cards, but I don't recall.