Hmm, coolness - Mesa always seems to have interesting options when it comes to the electronics of their amps (Simul-class being the most wild of the ones I know about).
And on the topic of the Powerball, I had heard that Emperor's "Prometheus" was tracked with a PB - I lost my copy of that awhile ago, so I can't reference it, but Ihsahn's first solo album "The Awakening" sounds EXTREMELY pod-like to me (but also sounds enough like a mic'ed cab that I don't think it is a Pod), so if he used a Powerball on that also, then I can definitely see how people would call the P-ball's distortion digital.