Hello Audrey,
Thanks for taking the time in putting forward your thouhts,
If you re-read the initial comment on the forum posts you may realise its an unusual problem
Nothing to do with a floppy or SD Card.
The K7 just on its own---if initialised puts the Keyboard in the Midi mode

In any mode you cannot access the Fingered mode under APC
If you put in a Tech disc with a song on it goes to midi and it discords as it can't access the fingered mode. and wants to play everything at a speed of 300.
If a floppy is inserted that is Midi it loads in as Tech

I have been wondering where the long standing Technics Forum people are, but things are waking up---- We sincerely hope that in time we will eventually get the problem sorted or have to buy another keyboard.
Unfortunately Mr Technics has made things very difficut for owners of their products [servicing, parts etc. ]---- we own more than 6 Technics products--- keyboard , organ and PR900 piano. We are grateful for the several help messages we have received via Technics Forum as well as direct emails.

Dave and Viv L.