I just listened to your newer version using SRX-04 strings, and I do hear a marked improvement in the strings. They're very realistic.

I, too, often think how sad it is that Roland had such good quality orchestral sounds so many years ago, and like you said, they haven't developed any better ones. I wish they had. They should record all new samples of orchestral instruments and put them in their forthcoming keyboards, or at least use them in new "SRX" expansions. With today's technology, it would sound much better.

Same thing applies to Kurzweil. They were ahead of their time 30 years ago. Imagine what they'd have now if they'd continued to evolve, instead of using/recycling their old orchestral sounds with every new keyboard.