Hi,
I did a quick video review of my KPA in occasion of the first concert I played with it
http://www.theapplelounge.com/…mplifier-videorecensione/
It's in Italian, but even if you don't understand the "bel canto" language you maybe can find interesting a video of the profiling session (vintage Marshall mod. 1962 "Bluesbreaker")
http://youtu.be/HDzrjKOn5Ck
(skip to 1:35 to go directly to the first comparison A/B)