Gee, you must have grabbed your Kemper when they first arrived. I’ve had my toaster about 9 1/2 years (April 2012) and I’m still in love. o_O
Previous to getting the KPA it was tubes since ‘63 (mostly Fender).
As far as a new interface I would recommend this...
I've had one of these for several years. Its s/pdif works well with my KPA.