Agreed about the high end, from an artistic standpoint. I thought you had boosted the treble, to make the issue easier for us to hear. Is this a single coil, low output guitar?
I normally use a PA speaker. If it is easier to hear when using a guitar cab, have you tried using profiles that were created without a cabinet, with the Kemper cab "on"? If not, try some of those, and see if that solves your problem.
Culd the distortion be coming from overdriving the input to your power amp with the Kemper?
No, didn't boost the treble, I left exactly as it was in the profile. (which again, was chosen for the extreme signs of aliasing)
What you heard before was a DiMarzio Evolution bridge humbucker, so not even low output. Anyway, I put new clips (see below) also with lower output humbuckers. I guess the alder gives it a very bright tone.
I have used "preamp only" profiles: one I created myself based on my head, and that - though not completely alias-free - behaves fairly well; the others I tried, downloaded from the Kemper webpage, also show a lot of aliasing (the dirty tones, of course).
Finally, I am not overdriving the power amp, and the clips prove it, as I recorded them directly from the Kemper's outs.
Now, update:
I made new clips. Hum-free this time, which makes the aliasing really easy to hear this time, both with and without cab simulation.
I used two Yamaha Pacificas, one with a DiMarzio Air Classic pickup (bridge, medium gain) and one with a DiMarzio Evolution (bridge, high gain), and I made a clip for each combination guitar-cab sim on or off.
I loaded the clips here: https://soundcloud.com/simone-frau-2/sets/new-alias-clips
and you can also download the wave versions from here: https://drive.google.com/folde…94cS1KUFNCNEU&usp=sharing
I tried profiling a lowpass filter (plugin on my pc), the result did not help much: although the filter was set at 20kHz, the overall sound appeared somehow a bit muffled and still retaining the aliasing.
But this is a hardly reliable try:
1) the PC plugin has a noticeable latency, the profiling might all broken in such a scenario I believe
2) the cab is not the profile that I made, but a part of it that the Kemper estimates to be the cab part of the profile. The result is to me completely unpredictable (and most likely irrelevant in our analysis)
So, enjoy the extremely boring clips