I love the feeling of licking a tech problem - in this case, audio disappeared from Kdenlive (Linux video editor)
I installed a virtual audio patchbay and discovered it was going to the wrong device. Now fixed.
I knew my knowledge of audio routing was deficient, and now I'm slightly better armed for future problems.
(The solution, by the way, was to find which audio systems I was using (inxi -xA pointed me to Pipewire), then install qpwgraph and drag the Kdenlive outputs to my main audio interface inputs.)
