Hi:

I did not see if any use the "Instrument Definitions" on the cake, I am also a CAke/Sonar user and I had no problems when I had my Ketrons, the X1 HD and 2 SD1s.
Are you editing a existing midi file and or are you making a midi file with your Ketron using styles/patterns??? I hope I can help you guys...but, just in case, I would download the Instrument definitions/template, and insert them into the folder where the Cake is install (usually in the program files in your "C" drive PC).