Thanks for that explanation! I guess, concept-wise, it doesn't sound like it's vastly different from a Delfina or another of the old soundcards with a hardware MPEG decoder (but without recording ability?).
I think I mentioned it when the board was announced, but I would like to suggest again an mpeg.device compatible software interface at a later date/in addition to/instead of an MHI driver. I don't think MHI was used for anything other than AmigaAMP, whereas there are a few more programs that can use mpeg.device (including MHI). I just discovered
this one which sounds really cool and could open up the possibility of hardware decoding to a lot of old software.