I have two different Americana Disks - one is reading KN2000 and the other KN3000. I haven't played them for years but after reading this thread I tried them today on my KN7 and they play fine. All disks made for older models need tweaking anyway, has anyone ever had a commercial style that was completely to their taste?
When I upgraded to different keyboards/digital pianos etc., over the years I would send my Technote disks back to Technote and in those days they provided a free conversion service - this was a long time ago and the disks in question could have been PR900 disks which they replaced.
The current brochure of Technote does not list the Americana disks.