thanks John. You've answered some of my questions.

Since trying to get my music stuff working again, I have managed to get Amplitube 3 working with RB on one of my computers where it had never been installed before. As I sort through all of my various plugins and licenses, I see that multiple versions of amplitube have been installed on my main music computer in order to fix the problem, and now I'm wondering if that hasn't made it worse. Today I'll uninstall all installations of Amplitube on that computer and start fresh. I am encouraged by the good results on my other computer where it was a fresh install.