This is an interesting article.
The Sx70, Sx75 and Genos keyboards can save custom effect parameters in registrations and OTS settings. The Tyros and older boards can't do this. In fact, the newer boards do it by adding SysEx messages to the registration files in the same way that this article describes.
It would be *really* nice if the registration manager utility had the option to add these effect parameter messages into a registration file ...