Lloyd,

I believe you know what I think, but I had been using the Korg arrangers since 2008 in rotation with Yamaha arrangers. I'm happy to read what Tony and Bernie wrote shows it no matter what background experience you've had with an arranger you can make the transition. I've never used Ketron so I can't give you input there on how easy or difficult it is to get a handle on Ketron, but you have done that with the SD7, I don't imagine Krog would be more difficult to get a handle on the OS. I'm thinking Frankieve could give you an opinion as well as DonM, maybe others too who have used all 3 brands.

Good luck and just give Frank a call in the morning place that order