...But not three.
You don't think the guys at Kemper know a thing or two about digital audio...?
I believe they do know... A lot. It's common digital audio knowledge, my implication.
Sample rates higher than 44.1 will encounter some issues on many playback devices. Most all playback devices can handle 44.1. When I make my backing tracks (on SD cards or usb stick)they will not play on my loopers or my drum machine.
The Kemper Profiler USB Audio should support all sample rates. For all users needs. It should not be a compromise.