"Rob" wrote in message
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There are also various choices that could be made when
using one version to create the other, that then vary
the output. e.g. I understand that at one time Tony
Faulkner preferred a simplistic form of downsampling
that doesn't actually meet the sampling theorem. He
preferred the results, presumably because he thought it
made a 'change' that he liked. Or because it minimised
in-band filtering at the expense of aliasing.

That's really why I ask - I think. If there's more than
one way to downsample properly, I'm stuffed.

Not only are there many different downsamplers, with vastly different levels
of accuracy, but there is a time-honored process of simply starting out with
differently mastered recordings.