Thanks John!
So I'm slightly too optimistic here....

Synth_guy:
I swapped the to PA1XPro yesterday because the PA1X model did not fit well in my desk and I do not need the speakers at all. (The keys feel much better)

I'm not able to compare it with the other PA-models because I simply don't know them

The PA1XPro sounds very OK in styles and sounds.
I hope to be able to study the operating manual the coming weeks.