Can you please be more precise? What things in Synchron Strings I will you keep using, that are not already in Synchron Strings Pro?
Well, for example, there are much more dynamic layers in SyS I. So, it's very useful for very expressive passages. And I really love the soft sustain and legato patches. So, I think I'll still use them. As I said, I don't have SyS Pro yet, but I'll tell you more when I get the library. And as another example, even though I own SYNCHRON-ized Chamber Strings, I still use VI Chamber Strings I. Both libraries bring something different. I guess it will be the same thing with SyS I and SyS Pro.
Best, David