In the FAQ Kemper write:
"Is it possible to profile a solid state amp?
Yes. As a matter of fact, the Kemper Profiler comes with four factory profiles taken from one of the best-sounding solid state amps in history: the Roland JC-120."
But in my experience the Profiler does not capture the gain structure of transistor / solid state amps and pedals well. For example profiling Quilter amps, Marshall Solid State amps, Peavey, Orange Solid State amps (Crush Series, Bax Bangeetar) or "amp in a box" pedals - all are missing the characteristic grainy distortion when notes fade out. Kemper seems to smooth that out and makes it sound much more tube-like. What sometimes isn't a bad thing soundwise But it does not capture it correctly.
Is there anything I can do to make this grainy, crumbly distortion happen? Any tips? Are there any profiles out, that really show this kind of distortion?
Also some amps (tube or solid state) that produce a fuzzy character don't get captured correctly as well and with the same "depth". The results are more innocent, cleaner or sometimes smoothed out when you have a direct comparison.
I also wish, that some of my favourite pedals could get captured too. So in the end the Profiler (and also Quad Cortex) have it's limitation. The last days I tried again to make authentic (!) rigs with BOSS HM-2 with all tricks I could think of. It is not possible!!! Kemper does not capture it correct enough for me. Or my T-REX DIVA Drive or EHX Flatiron Fuzz...
On the other hand I recently made some profiles of tube preamps like Laney IRT-Pulse, Engl E530, Rocktron Valvesonic Black Plate (into a power amp IR, for avoiding gain staging problems) and the results are perfectly representing the source tones! Not even refining needed, no tweaking, nothing - they came out perfect right from the start.
So it seems this is where the Kemper Profiler delivers the best results. Tube amps with preamp section dominating the sound and power amp giving character but not too much gain.
But if you boost a cheap Solid State amp with a pedal that Kemper can't profile correctly and run that through a power amp simulation with gain - Kemper seems just to "guess" or "improvise" and the results sometimes sound better than the source - it just makes it a tube amp rig, if you want it or not