Tried it , to my ears it sounds best at about 6-7 ....but that's just my ears ....
Also , what does the cabinet 'Blend' do in the Debug menu ?
Makes me wonder if we're going to get parallel cabinets or something.
Also to access the debug menu, go into system, and hold the system key for a few seconds. I wouldn't advise changing any of the values other than the fsample rate. Other things can and could easily ruin your kemper.