NVM -I found out on some other threads that the expectation on these later drives was that audio would stream through the IDE cable and in Windows, so while they went through the trouble of installing these connectors on the drives, adding time and a little bit of money per drive and having to print "audio reserved" everywhere like frickin' dunces, they don't work and thus absolutely no CD audio in DOS. All well, the Teac and the other DV DL are going back in, and I'll set these stupid LGs off to the side-like.

There is literally always something (often one stupid thing after another) with every one of these builds.

Nice Price ! Yeah those are 2008ish last of LG IDE so made for XP and Digi Audio. I think the issue with LG GH20 and GH22 series is that they were switching to SATA only which never seems to have a Analog output and so cheapened the last of their IDE series. There is a good review on the gh22lp20 at cdrlabs but they never say anything about the analog output, of course they are running XP so does not matter AND the manual says "connector not supported" like the GH20lp20.
added: I do like the LG DVD and Bluray burners, have a few and they always work well and seem to last a long time but they are all SATA in newer NON-DOS boxes....

Does this apply to the last PATA models from other manufacturers too?

Probably. Direct audio output on IDE drives started to disappear around the time DVD-ROMs became common because windows 98 defaulted to using audio extraction for playback, and it saved the manufacturers from including a DAC.