Henry01 & Maged: Thanks for your explanations. Assuming that the X1 and Sd1 operate similarly, I do have a few more questions to ask in order to better understand the concept of 'block' and 'single' registrations:

Is a Sd1 'single' registration actually a subset file (one of the 198 memory locations) of a 'block' registration, or is it a separate file completely unrelated to the 'block' registration file?

I assume that a Sd1 'block' registration is equivilant to the Technics 'Panel Memory' registration ( capacity up to 80 single registrations) and that each SD1 'single' registration is equivilent to one of the 80 single registrations on the Technics, right?

I understand (from what Henry is saying), that Sd1 'single' registration files are stored in a separate hard drive folder location than where the 'block' registration files are stored. Can a 'single' registration be then imported into one of the 'block' registration's 198 memory locations and become part of a 'block' registration?

Technics KN keyboards have 8 separate 'panel memory' buttons (in a row) which allow you instant access to 8 'single' registrations. There is also a separate 'bank change' button which allows you to change banks (1-8) giving you quick access to all 80 'single' registrations. Does the SD1 have a setup similar to this? How are the 198 memory locations of the SD1's 'Block'registration accessed? Via a set of buttons like on the Technics KN keyboards or?

Maged: Glad to hear that registrations are assignable (up/down) via footswitch.
I assume that to perform a customized song, you would load a 'BLOCK' registration consisting of 'customized single' registration setups for different parts of a song (verse, chorus, bridge, etc), and then use the footswitch to trigger registration changes incrementaly, right?

Thanks again in advance.