Given how hard some find even operating their hardware arrangers, and converting styles successfully from one manufacturer to another, I am afraid you may be overestimating the ease of it all...

After all, a rocket scientist doesn't think that rocket science is hard at all! I think you understate your abilities, Dennis.

I completely understand about your use of VSTi's variations. But what I'm simply pointing out is that, however many or few VSTi variations you set up, the determining factor is how many you NEED, to be able to play each manufacturers styles with the minimum of tweaking. After all, many of us here, particularly the hardcore style users (not the SMF crowd) have thousands of styles. Hand tweaking them ALL will be daunting at best. Probably to the point (like many have already done) of giving up.

There are 1,759 distinct sounds in a Tyros 4 and 44 drumkits and SFX kits.

There are 1,100 sounds in a PA3X, and 90 drum kits.

I'm not saying you don't have enough bank room in a VSTi for all these. I'm just saying that CREATING them is the herculean task.

It's either that, or hand tweaking each and every one of your thousands of styles. Whichever of these is the greater task, even the smaller task is no easy feat.