The new update seems to have corrected the footswitch problem!??!??
And after tests, The output noise problem (when I disconnect the power cable) is only present on my home-working equipment: A Roland BA-330 (Powered or on battery and on any input, XLR or Jack)
The Kemper stage is the only equipment I have with that problem (no problem with TC nova system, Pod, Torpedo CAB, mixing console...)
Any Idea?