I'm just getting started trying to learn my way around linux audio, and obviously my knowledge is pretty limited. When I open up alsamixer, I can select the UMC404 as a soundcard, and see that none of the inputs are muted. Similarly, other applications like Rakarrack and Audacity don't seem to see the interface when using JACK. But I just can't get it to work with JACK. If I set the audio device preferences in REAPER to ALSA, then it sees the UMC404, and I can use it fine. I'm mostly using REAPER native linux for my DAW. The only audio I get when I make connections to the 'system capture' is audio from the on-board microphone. And whatever application I try to use, whether it's my DAW or another application like Rakarrack, I can't get audio from the interface. But the interface does not appear in the JACK connections window. I go to 'setup' and I can select the UMC404 as the input device. I plug in the interface and fire up JACK. The interface is a Behringer U-Phoria UMC404HD. I'm having trouble getting my audio interface to work with JACK.
