Maybe i should test this on the zoom multi effects i have or maybe even a helix again but
I could swear that the kpa is the first amp i can actually hear the dynamic difference of pick size.
Its been a while since I've had a regular tube amp around so i won't be as so bold to suggest that they are included in this idea. But i definitely remember my pod hd 500 and it didn't have that definition in pick size for sure. It was only a mechanical playing attribute.
Chairs!