Hey, it looks nice! But, are you required to be running JACK? I mean, isn't this routing capability part of the PipeWire's core?

No, I don't have jackd running. Launching something with `pw-jack` (AFAIK) makes that use the PipeWire libraries instead of the normal JACK ones. I think PipeWire has it's own internal graph that's compatible with ALSA, PulseAudio, and JACK, and that's how it can work with any program. Here's the output of `pw-dot` which is a PipeWire tool that dumps the graph: https://i.imgur.com/OMZCcmC.png