Found this and it is really a extremely interesting read / watch.
Aside from the story of building a custom amp chasing the ever elusive brown sound, at around the 11:00 min mark in the video they mention capturing the sound of this new amp circuit on a Kemper and how it was identical but also even better than the amp! I must find a way to get this profile. I may reach out to them and see what's possible in obtaining it.