No, it's not possible easily
Here some way to do that
1) Buy this product from Atmel to creating sounds (900$ !!!), or find someone have it:
http://www.atmel.com/dyn/products/tools_card.asp?tool_id=2740 2) Use the Atmel software for creating a file for their chip
3) Convert the file from Atmel to a Ketron file using a little ketron software to make the 8 or 16 SND disks (you must work for ketron to have it, note that perhaps it's not so difficult to that software...)
4) Enjoy (you will never)
There is a lot of oriental people that need that.
Cause ketron doesn't really want to do what we need, and don't take time to corrige their bugs, I think I will create my own arranger keyboard. If you have good sounds, please contact me, we will see...
Dan