Rich, Unfortunately this is a non starter. IDE converters won't work, the software emulators would need the software written to understand the technics interface to standard floppy drives, likewise for the datastorage device. Considering the costs involved you would be better putting the money towards a more modern keyboard with better a sample rom than something like a KN3000.
Hi Tony, yes keysoft made 2 versions which Walt Tenay asked me to write some small booklets for many years ago. The basic version was HX3 and had 3 partitions, each partition had 240 directories or folders, each folder with 16 technics save slots with a useful 26 character naming. Floppies could be copied to a folder in one pass, but only with the floppy names on the keyboard. There was a free pc program which allowed you to write long names on the pc for each floppy file which then was copied with the floppy direct - much faster than loading, renaming, and saving each individual file.
The more expensive version was HX6 and added features such as 100s of programmable playlists and a ram screen to load up some future tracks while a song was playing with auto start and auto load. It had 4 extra audio out sockets which could be programmed to output various parts. Also a parallel socket which connected to your pc or laptop with a program in windows to backup the disk, transfer files and folders, rename, re-order, edit playlists etc etc.