I now understood that that different Midi controller handle it differently, and that the formula is not wrong.
And I know how to work with it, so there is no practical problem for me.
But that Kemper itself does not decide which way they want it confuses the user.
As far as I understood, Kemper says I could use the formula to get the numbers or I can check them on the display.
But if you do that, you will see different numbers....
For me, that would be a bit like telling the measurements of the kemper, but not telling that the height is in inches and the width is in centimeters. Of course both numbers are correct....
"Why easy if it can be made difficult"
I got it. Hope that not too many others will get this problem..