That one needs a lot of work.
Milan Digital did a totaly new design on VSTi version, sending sys ex VST link. Luckily REAPER supports such a thing and the manual has long tutorials on how we can make it work, also with Cubase, Sonar and Cakewalk. (Thanks guys !)
I'll treat this issue later in deep, but as far as today, I found it very tricky. Is totaly different from what we knew so far, actually we cannot see a HW4 VSTi inside Reaper, they work in parallel, and virtual (or hardware>>>) midi cables are needed.
Maybe this is a better way, will see. Real time reverb can be applied this way and full support for multi audio (16 stereo audio ch in Reaper....) but I'm curious if I can work with HW and EWQL symphonic Orch the way I did with HW3.
One thing that is definately not possible, is to open a Reaper project with HW in and the set opened on the spot along with Lexicon and other instruments. Manual load of the set is needed now and outside Reaper..... hmmmm