Looks like a good lighweight setup.

Would be interesting to know how the Ketrons are used since they seems have no proper Registration Memory.

Normally you have a few registration memory locations, typically between 8 and 16, where you save your settings for 1 song. Then you save it as a registration bank for that song.

But Ketron manual says 4 banks with 1024 memory locations each. I can simply not understand how to use it? Am I missing something? Are Ketrons designen to use only 1 setting for each song or do you in some way have several settings in 1 registration memory?

I would be interested in getting a SD40 or SD90 as addon to my organ but this turns me off. Would be appreciated if someone using Ketron could comment on how it's used.