Ignantios is comparing the twang of his real deluxe to a kemper's direct amp profile of the same amp (or similar fender amp with crystal clear clean sound) played through every guitar cabinet you can imagine, not through a FRFR. A fenderish clean direct amp profile through every guitar cabinet doesn't twang and it won't, because twang is a characteristic of tubes.
Thanks for putting this straight. I did read your comment more than once and always understand twang is a characteristic of tubes (not sure wether this is without exceptions). Thus a direct amp profile of a tube amp does not produce twang. If this is what you said then I'm even more confused because the tubes definitely don't get lost in the amp when profiled directly. I am quite happy with studio profiles or merged profiles so maybe I sholuld be quiet in this specific context. Those clean (merged with cab off) profiles I tried with the kemper and a solid state amp and a proper guitar cab produced all the the twang I asked for. I would not use the kemper that way fpor real though.
I sometimes get the impression that a considerable part of this discussion here is about amps and profiles driven to Desperation gainwise. So some of the real or believed results (including mine) may not be true for lower gain usage.
I like Christophe Seyler's plain and reasonable summary of the question in question. If this is true (and some results seem to endorse that notion) it chould be checked by Kemper or otherwise falsified.
Have fun
Joachim