Of course this is not an optimal solution so I am in search of the proper fix. I reached out to the IDJC developer (project page: https://idjc.sourceforge.io) and he found that IDJC worked on his system with Pipewire .77 with no issues. He then tried with Pop OS and can reproduce the problem. His take is that it’s a problem with how Pipewire was compiled for Pop, not a bug in either PW or IDJC.
Source:
about 1 year ago