Many DVDs have Dolby Surround encoded tracks that are only 2 channels using the Dolby Digital codec (.ac3) and that is a lossy codec as well.
Actually I meant the "Dolby Surround" introduced in 2014 that supports height channels and all that, not the "Dolby Surround" from the 1980s. It's confusing because they re-used the name.
It's my understanding that lossy codec developers only consider and test the scenario of playing the audio as-is with no further processing. So I wonder whether sophisticated full-bandwidth upmixing could reveal differences that would otherwise be inaudible.
The method does use the Foobar plug-in, but as far as I can see, it only runs in JRMC (which I do not have) and although I have the iFi Micro USB, unfortunately I do not have one of their DACS. There are a couple of professional software suites that may do the conversion, but they are very expensive. I had hoped that by just using the Foobar plug in I could do it totally within foobar using my own DSD capable DAC.
From your advice however it seems like I might be wasting my time, but even so, just to appease my own curiosity, I would like to have a go if anyone could tell me how (without buying JMRC, an iFi Dac or expensive software).
On the plus side, the work on the time machine is going well, just a few minor issues to resolve. However, as interesting as I find digital audio, my first trip will be back to 1960 to buy as many new Decca SXL recordings as I can!