Hi Gunnar,
I do agree : We need a good manual !
As long as I use the SD1, I had NO freezes at all.
The user interface is much better than the X1's, but still not always intuitive.
For example : I want in power-on setup the Keystart and aftertouch ON and on top of that a RAM-block of my choice loaded.
(I don't know how to arrange this)

The KN's interface is easier to operate and even a non-technical user will find his way.

Well, perhaps Ketron one day presents a real document..... I hope so because musically the SD1 is the best ever, at least for me. (Technics is a way behind in styles / sounds...... IN MY OPINION !)

Roel