The extracted vocals sound great! But the resulting accompaniment tracks I've heard so far (tried on a handful of songs) aren't of usable quality for most purpo

The extracted vocals sound great! But the resulting accompaniment tracks I've heard so far (tried on a handful of songs) aren't of usable quality for most purposes where you'd want an instrumental track – they're too sonically mangled. Since people are often interested in doing this for a handful of specific tracks and not necessarily en masse, I'd be curious about what a human-assisted version of this could look like and whether you really could get near-perfect results... What if you explicitly selected portions of the track you knew had vocals, so it could (1) know to leave the rest alone and (2) know what the backing track for the specific song naturally sounds like when there's no singing happening? It could try to match that sonic profile more carefully in the vocal-removed version. Or what if you could give it even more info, and record yourself/another singing (isolated) over the track? Then it would have information about what phonemes it should expect to find and remove (and whatever effects like reverb are applied to them).