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A lot depends on the original stems and elements.
If you look at scores being recorded now, by, say the likes of Tadlow when they're doing their REAL job of session scoring, there'll often be many recorded individual channels for each instrument (the 'microphone in every orifice' approach) and in those cases the whole thing can be remixed anew, and re-equalised layer by layer.
With older recordings, different frequencies, bass etc. can be altered to favour say a woodwind that was submerged in some previous mix.
Often these days it seems to mean pushing up the amplitude and throwing in some bass.
I recall FSM saying that when they approached any old mono source they laid on a VERY SLIGHT stereo spread, an approach which I think is wise and works well.
Sometimes reverb is removed from a previous release. You can never remove reverb from a source where it was originally present but you can go back to source and simply omit it.
You can fix anomalies like wrong keys that result from bad transfer rates, and remove noise, as well as change stereo spread to produce a better, less separated blend. It's also possible to add slight reverb to gloss over clipping on old tapes.
And it has been known to just slap a 'remastered' label on and hope no-one twigs.
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I don't know specifically but remember that any home audio release of any studio recording is going to be lower-fi than the original masters. So even if two releases are from the same masters, there is generally always scope for a better, more spacious transfer from the original masters than before.
Plus, as others said, better white noise reduction and click removal, i.e. better repair of artefacts.
But also not all improved titles do come from the same masters. Think In Harm's Way. First CD release was mastered from an LP. Re-issue CD was mastered from mixed album master with reverb baked in. Subsequent re-issue mastered from clean multi-tracks with the final mix and reverb not yet baked in.
Cheers
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And technology is improving drastically in the mastering world. I remember sometimes in the last two years a label released a score where they said just a few years prior, the tapes were in such shape it wouldn't even have been possible to release it.
And just for a laugh, what MV said once in another thread on debating mastering:
Y'all just a bunch of mastering debaters.
;-)
MV
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