Hello Kees Wisse,
Whilst I only had an hours demonstration on the Pegasus keyboard, I have downloaded the Manual which is quite self explanatory as there are written instructions coupled with photographic demonstrations.
I realise it isn't a 'workstation' (I think the price reflects that) however, you can still do quite a lot with it. Firstly you can put the split point ANYWHERE on the keyboard which, particularly for left-handed players, is a real bonus.
My understanding is that you CAN 'modify' the styles (I call it 'tweaking') and almost every preset style has several blank files where you can save your sets as a USER Preset. When these spaces are filled up they can be copied/cut/pasted to either a USB stick, CD/DVD or to the Hard Drive direct. The CD/DVD player/recorder can be used to play commercial as well as your own discs. It has two USB connections (for loading/importing, saving/exporting). You can also connect a USB mouse here and in case you're wondering why you would need to, it is because this keyboard can be used with Windows 7, making it much easier to compile and find your own song lists.
Of course, I am nowhere near an expert on this, but I'm beginning to get the picture.
As for in-depth changes, well I don't usually go in for much of that, as I like to play, rather than keep button pushing and I think people like myself is probably what Wersi had in mind when designing the keyboard. Keep it simple eh?
I agree with you about the similarity with Roland, Technics and Yamaha. When the young man was going through the styles, I spotted a Piano Boogie which he allowed me to play and I said immediately, "I've heard that before on my KN7000" and to my surprise he then told me the keyboard also plays Yamaha styles?? As I have a Tyros 4 and quite a few saved styles, this is also a bonus for me.
The only worry is will I be able to play it - my hand isn't much better and still gives me grief.
Grrrh!
Audrey