https://auphonic.com/blog/2018/06/01/codec2-podcast-on-floppy-disk/
Interesting discussion of improvements in Codec2 decoding, using machine learning.
Also in Codec2 news, holy crap, FreeDV 700D works *well*, even on really crappy signal paths: http://www.rowetel.com/?p=6103
The other day I found my Avid XPress FreeDV cd so I definitely was thinking about that when I read this toot.
(Note that the source I linked to is a podcasting service, they're apparently investigating using Codec2 for podcast distribution, and already use Opus.)