It’s the wooden cabinet sound I guess. This tone has a mid range gained honk to it mixed with a bit of gain.
Ahhh yes. I am writing a VST and I added a 150Hz low Pass filter and run it thru some distortion to get that cabinet thump. Then I made a pedal that is just a mid range bandpass filter with some distortion.
Not sure how to recreate that in the Kemper. Could try some Overdrives and use the mix control to just add a touch. But most overdrives are bandpass filters set to around 700Hz. And you are looking for something between 100-400 Hz.
Another option would be post amp EQ followed by a compressor. Then you could over boost the lows and then try to tame them with the compressor. (Thats right 5 words in a row that start with T, a new world record). I usually set the low EQ of the Studio EQ to 180Hz and boost up gain from there.
The distortion I am using is similar to the Kemper Soft Shaper. You could play around with putting that before and after the amp. But it will be pushing ALL frequencies. So the next step would be a parallel path setup with an EQ and KSS before the amp, but then it bypassess the amp so that wont really work either. Need a parallel path mix option in the Kemper Before Amp/After Amp. Does it exist?
So basically just download JUCE and write your own VST is what I am saying
The last option would be to get some IRs in WAVE format (normal type) and edit them in an audio program. You could then add a ton of low freqs to the IR. Generically they start to get compressed sounding when you do this so a little high boost is also necessary. I have made IRs using a graphic EQ after the mic to adjust them at creation.
If you get crazy, I have added one of my IRs that I tend to use the most. It is a little more thumpy than most IRs but also a little crispy and in your face. Made on homemade 2x12 cab with eminence speakers and EQ'd Behringer C1 and SM57 mics.