The real problem with digital, at least with uniform PCM is that you store logarithmic data in a linear file format. Sure, adding a bit will add 6db to your dynamic range. But once you go to a more silent part of your music you lose resolution exponentially. A CD has 96db dynamic range on paper? You wish, since going to the range of -90db to -96db your resolution is one single bit - on or off in that whole 6db range - in practice completely unuseable.
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