I think this has been discussed here in the distant past, but I've just fallen down the rabbit hole at https://www.monotostereo.info, where there are quite a few examples of songs that people have converted from mono into shockingly convincing stereo. I wound up looking it up after buying a CD with the processed version of the Shocking Blue's "Venus" on it. Pretty sure the Beatles example was posted here long ago but I don't remember being aware of any of the others.
I'm finding that in a lot of cases even after YouTube's lossy compression that the upmixes actually sound cleaner than the mono originals. Not sure if that's just stereo playing tricks on me or if the upmixers are playing EQ tricks once they have the individual elements.
I'd swear that the version of "How High the Moon" manages to separate Mary Ford's double-tracked vocals and puts each performance in its own channel. It's mind-boggling.
Obviously the tools they're using would be incredibly useful for making surround mixes as well.
I'm finding that in a lot of cases even after YouTube's lossy compression that the upmixes actually sound cleaner than the mono originals. Not sure if that's just stereo playing tricks on me or if the upmixers are playing EQ tricks once they have the individual elements.
I'd swear that the version of "How High the Moon" manages to separate Mary Ford's double-tracked vocals and puts each performance in its own channel. It's mind-boggling.
Obviously the tools they're using would be incredibly useful for making surround mixes as well.