I ONLY used the Block registrations, and at the beguining, I tried the Single registrations, but, to ME, was more practical having the block registrations that I can load almost instantly 198 registrations, instead of Each one...
I know that You can select all the file wherever they may be and either copy, delete, load, etc....but, still take more time, and since at the time I had a second SD1 backup keyboard, with ONE single small file, I "cloned" the #2 SD1.