In an ideal world, we would all have sound proof booths so that we are only comparing the miked sound from the reference amp with the Kemper profile, with no bleed from the amp itself.
I suspect many of us are in the less-than-ideal position where we are monitoring in the same room as the miked up amp. When trying to A/B the amp against the profile, I am currently having to do this:
Switch to Kemper Amp
Walk across room and unplug the cable from the reference amp input
Play guitar
Switch to Reference Amp
Walk across room and plug the amp cable back in
Walk back and mute Kemper outputs on the mixer
Play guitar
Repeat from the top
It would make life easier if we had the option on the KPA to just mute the Direct Out when listening to the Kemper profile and the Master Outs when listening to the reference amp. I understand that it would not give a perfect A/B comparison as the Kemper is profiling what the mic hears, not necessarily what we hear from the amp in the room, but it would make the workflow easier for those of us profiling at home rather than in a studio.