All I know is, is that modern roland gear like the ones you've mentioned arent built very well, and sound terrible.(well, not terrible, but limited fidelity.)
Have you thought of a kurzweil sampler with the vast engine? I'm not sure if all of them sequence, but I sequence everything on a macintosh from 1995 or an Sq-80, so there's ways to get around that.
However:
I played a Juno-G at a music store. I pushed the frequency of one of the oscillators past what it could actually render and put sample and hold on it, and layered that with a choir sound. It was absolutely wonderful. The high notes were ring modulating because of the foldback, and the choir sound was filthy. I thought it was excellent.