I'm not clear if you are posing a question Unsound. And if you are, I don't have enough knowledge to respond...but, definitely not a digital system (so far as my understanding of digital systems are concerned)
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Just read a review of a Bel Canto Reference 1000 on 6moons. Both the Underwood mod as well as the original. The reviewer 'bought' the original. Review sounds intelligent but I've found contrary user comments on tone in other forums. Its a small and very powerful switching amp. FWIW as I've yet to hear one.