I us SD Cards for two purposes in my KN7000. First and foremost I use them as a repository for my settings for the music that I play; and all of that just about fits onto the 99 folders and files contained therein of one single SD Card.
The second purpose for which I use SD Cards in my KN7000 is to keep audio files (like MP3s to the uninitiated) of all the backing tracks that I use with my 5 female singers. Now this is where I have a problem sometimes despite using SD Cards which more than needed capacity wise. First loading of audio files via SD Jukebox is usually fine but occasionally subsequent audio file additions cause the SD Card to appear to be empty when placed in the KN7000 despite SD Jukebox confirming that the audio files are definitely on that SD Card - much fiddling around is then needed to correct this situation...
I believe that were I to change the opewrating version of my KN7000 from ver 1 to version 6 it would resolve this situation but I damned if I can make the bit of software provided to carry out this update the be read by my KN7000 - cos it won't fit onto a floppy disk...
So I put up with it...!!!