LinuxMusicians

https://musical-artifacts.com/
Maybe upload there?

Don't worry, your system is fine. I'd delete the ppa lists, update upgrade the system. Add the kxstudio repos (make absolutely 100000% sure to read the info on the page, because things have changed recently) And just reinstall your packages. As long as you didn't wipe your config files in your home ...

check the contents of the files
probably there are things commented out with a `#`

IIRC when upgrading Ubuntu all ppa/external repos are disabled.
Could be a cause of things.
Check /etc/apt/sources.list.d/

Oxygene4 is inspired by this song.
https://www.youtube.com/watch?v=NjxNnqTcHhg

I have that same mixer and it works perfect with Linux, out of the box.
There's a little red button on the mixer panel that routes the audio through the USB.

If you are running jack while ardour starts it automatically uses jack.

Which soundcard is jack using? And also, ardour works fine (better?) with alsa, so you might wanna skip jack. Stop jack (if running) and fire up ardour. Ardour should ask which audio backend to use. Select alsa and , *very important*, the correct soundcard. I'm guessing you want the behringer select...

Well, it's made with JUCE and IIRC the framework compiles standalone apps and plugins in one go.

Oh no, what did I break now again! I just make up version numbers on the fly it seems. I noticed that the last one was v0.1 and now am at v0.2.0 Is that a problem? And be aware that the lv2 version doesn't work in all hosts. Vst should be fine. There's a note in the readme. Friendly reminder my "bra...

B.Jumble?

Wolf Shaper comes to mind.
https://github.com/pdesaulniers/wolf-shaper

There's a big red balloon on that page which says "unstable" and you don't know if they didn't test it. Maybe it worked on the distro the devs used it, you never know what happened. My bet it's something that sneaked in at the last minute. Some small edit or a failed merge or something that somehow ...