I use a lot of pedals - also with the Kemper.
Today I had the Mad Professor Lound'n Proud pedal running into a clean profile of a Hot Rod DeVille Michael Landau amp. For fun I tried it against my favourite Marshall Plexi profile (but using the same cab / IR). Like the real amp, the Fender DeVille ML profiles take pedals really well. The profile was really clean (reduced gain) to show the pure sound of the pedal. With a more gainy profile the transistor characteristics are even less noticeable. Can you tell immediately which is the pedal? First (A) or second (B) example?