Cool thanks. About the nuances: like you said, there's not much difference actually since it basically sounds like any other poly, but I just wasn't sure. Between the RS-09 and the Poly-800, I just needed dumb confirmation that there wasn't some other odd paraphonic issue that I didn't know about. In the RS-09 the limitation is obvious, but once you have individual envelopes per key, it kind of eliminates the most discernable difference (between simple paraphonics and polyphonics).
I think even in the fractional paraphonics that AG mentioned, the difference between those and real polys are minute.
Just to add some more info about where I'm coming from:
If I were to write complete songs that use only the most "primitive" synth sounds, there are a lot of things to avoid in using modern VAs. If you allow me to make an analogy, if you try to write something in the 'style' of Bach vs. the 'style' of Beethoven, there are some rules with regards to dynamics that you have to keep in mind (among other things). Some people break them, but some people do not. So in my case, if I wanted to write songs in a strict style of early electronic music, I just want to make sure I have every detail covered about what sound qualities are technically "correct" for the period and what aren't.
The weird thing I realized is that there's a lot of fuzzy overlap between paraphonic development and polyphonic development that it cannot really be organized by "period". Some advanced polyphonic instruments were developed earlier than advanced paraphonic instruments, so the notion of 'periods' is kind of out the window.
That said, if there is any kind of strict "early electronic musical style" that I would adhere to, I might avoid multiple envelopes altogether unless I am matching the sound of an RS-, Lambda, Solina, et al. Hope that makes sense.