I think I understand how this will work. So were you to know the original tone settings of a profile, you could opt to switch to one of the modeled tone stacks and input what the original tone settings were. But what is you didn't know the original settings?
Hypothetically, you have a fender twin, profiled like this: B2, m5, T8, P5.
In this case, the treble was bumped up and bass was cut some, presence and mids left alone. But you forgot these were the settings, so you just tell the KPA that the profile'd settings were all flat at 5.
So when you bump up the treble on the kpa, what happens? If I understand correctly, the bump on the treble would sound like bumping the original amp from say 8 to 9 or 10, even though the knob on the kemper shows a bump from 5 to 6 or 7 or so. (assuming 5 is the 12:00 position) On the flip side, turning the kemper's treble to zero would only get the original amp to sound like the treble is set to 3 or so.
If that's confusing, what I'm asking is, if you don't know the original settings of the amp and just tell the KPA they are all at 5, the changes on the KPA tone stacks will of course will not match the original values on the amp when it was profiled. However will an increase or decease on the KPA tone stack sound similar to increasing or decreasing that control on the original amp? Of course, is the numbers don't match, you wouldn't have the full range of the original knob in one direction and could go beyond the range on the other direction. But otherwise you could do modest increase or decreases and have it respond a little closer to how the original amp would have responded to modest bumps and cuts from wherever the original tone was set at?