I remember that a certain Mr. Chapman did a quite extensive video [ https://www.youtube.com/watch?v=wYbul0RlwhQ ] on the subject. Therein he talks with the man behind the modeler. At 4:15 he makes some rather astonishing (given what he said at Anderton's Music on the subject) remarks about the KPA. So you may find out what this thing sounds like when fed into a (tube?) amp via return input and hooked to a substantial guitar cabinet. You also may hear what "his guitars" i.e. guitars bearing his brand, sound like.
Maybe this is a place to look for an answer to the question at hand.
Me myself and I were not convinced. The KPA is an entirely different animal.
Greetings
Joachim