Thanks Caliedoscope, Seems it doesn't like PC. Even with the recent Kemper USB updates (release 10.1.2.47971), I can't use the 'profiler' USB audio driver directly. See attached below the error I get. The ASIO4ALL does not provide return audio back to the Kemper without unworkable latency. If anyone else has experienced configuring Kemper USB with FL Studio 21, I'd appreciate your comments. I have chatted with Kemper but they have not tested specifically on FL and say all DAWs should just work the same. Lame.
Kemper support: "It is an issue with Windows. With the generic ASIO4ALL driver, you get a noticeable latency. In a Mac environment, the Profiler uses the core audio driver."