[PROBLEM] Output to Loopback device

[robiwan]

What exactly is your usage scenario where you need to use Jack for audio routing?

I'm glad you asked tried to put up a clipboard picture of it... I'll try with text:
Sources (routed into JACK)
- Analog input(s) (Hifiberry 8-ch ADC ALSA) (nominally the output of a TV set running Chromecast)
- Moode (Loopback ALSA)
Routing:
- JACK
Processing (DSP):
- Carla (JACK plugin processor that can load LADSPA plugins)
Output:
- Analog output (Hifiberry 8-ch DAC ALSA) (to L/R speakers + subwoofer(s) )

Using the Chromecast IR remote, I'll be able to switch between the sources basically and set the output volume/mute.

Carla will be running a LADSPA plugin for room correction, which is the whole purpose of this setup (AFAICT CamillaDSP cannot load LADSPA plugins). And also, I need the analog input.