Hi Katrina,
I'm sure that you could transfer your KN6500 sequences to an SD Card, suitable for playing in a KN2600. You may have to carry out some minor voice tweaking.
To implement the transfer, you can use a program on your PC, called KN Explorer, which as far as I am aware, is still available here :
http://vision-4-life.nl/SDExplorer.htm There is a Trial Version available for download on this website.
I used this program to try transferring some KN6000 files from Floppy Disk to an SD Card and then checking them on my KN7000 and they worked fine. So, I would expect that they will also work on your KN2600.
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Willum
After silence, that which comes nearest to expressing the inexpressible is Music.
Aldous Huxley