Hummm.... I screwed up a few things. Attempting to correct now.
In this thread two solutions are proposed by gnttz79xro.
The first one is to change settings in /usr/share/pipewire/pipewire.conf. That's the one I tried. It improved things but did not solve audio issues in Debian 12 RC.
The second one contains a link to a resource that proposes to modify the WirePlumber configuration.
What I now did was to undo the pipewire solution and instead implement the WirePlumber solution.
I confirm that that one works great on Debian 12 RC4.
Apologies for any confusion I may have caused.
