Re-reading your post: you make a good point about audio quality. I have to admit I'm personally uninterested in (what I see as) emperor's new clothes audiophile snobbery, but interference from digital switching can be a real problem by causing high frequency audio noise.
I guess I'll try it sometime and see if it's a problem for me in practice. If it is, maybe I can find a small USB DAC, with a bit of aluminium foil shielding. Maybe dismantling one of the commodity PC USB external audio adaptors might yield what's needed, but I haven't tried that...
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