it's not just a question of Kodak, it's a question of multimedia versus SD.

The cheaper cards may well be multimedia which looks identical to SD in web photos but is the older format, thinner, with a pin missing, and probably going obsolete.

These may work with technics or midi files but you will not be able to load digital audio to the card, and thus lose that aspect of KN7000 functionality.

So if making comparisons always be sure to confirm they really are SD cards.