Scott,
You are correct that a Sd1 'block' registration is equivilant to the Technics 'Panel Memory' registration (80 in KN5000 & 198 in SD1) and that each SD1 'single' registration is equivilent to one of the 80 single registrations on the Technics.
You can call up any registration in the block registration memory by pressing the Block Registration button, and then followed by 1 to 3 numeric digits (1-999).
Single & block registration files can be stored in any folder and can be in the same folder on the hard drive.
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.
A single registration can also call up a .TXT file (lyric), a .MID file and a style file having the same name as the registration file.
Henry