A troll doesn't buy a$ %^ing USB interface and tons of cables and spend 2.5 hours trying to get it to work. A troll doesn't provide the routing details. A troll doesn't pack up his Axe III because he's happy with the tone that he's getting with the Kemper even though some basic stuff isn't working.
You'd be surprised at what we've seen here in the past don't take it too personally.
If Kemper is making me buy an external USB interface, and I'm having issues with a piece of gear that is relatively simple to operate, then yes. It goes back to the core issue of Kemper not offering a basic piece of functionality that's frustrating for this particular user in which case it's getting returned.
Kemper is not "making you buy" anything.
Why would you assume that just because a piece of gear has a USB port it is also an audio interface?
In that case, I'd have to return my phone, my printer, my external hard drive, my iLok, my midi keyboard, my.....