Thank you Kemper Support#1 and Burkhard for helping me.
Unfortunatelly I still could not solve my problem.
I´m using the (Legacy) Delay LOCKED so it the same for all rigs and should work like an effect pedal. The delay is always on.
I just want to ADD the locked delay effect to the sounds of my performance by using the Exp-Pedal A to control the VOLUME of the DELAY. In Heel Position -> 0 Delay Effect in Toe-Position -> Max Delay Effekt without changing the volume of the dry signal.
So If you could explain to me where I can adjust this in the Kemper menu it would be very helpful for me. I´m wondering where I can adjust the parameters of the Exp.-Pedal of the FCB1010 in the menu, because I know I did this many years before ...
Thanks again for your great support - I really like the Kemper after all this years!