Thanks so much for the concise replies. Sounds to me, that if I outgrow Kontakt, which has always been challenging for me, this is the go-to site for creating my own instruments. It might be a wee bit above my pay grade, but still interests me a lot. It's such a fascinating science.
I mentioned that I had a question, and I will make a new post for it. I'll label it "VST that serves as MIDI Controller for Roland VK7 function". I hope it's not ill-related. Thanks again - 🎓 TheProf