Only Mono Audio Input with gnome...? [SOLVED]

Hello
I’m not entirely sure. But it looks like after switching to the Gnome desktop and recently making changes to the sound settings, stereo recordings are no longer possible. To test this, I started Qjackctl and connected it to Audacity. There’s only one channel. What’s going on?

Btw, on a fresh Gnome with no changes made on the config it is the same…

Here are the sound settings. The audio interface is an external USB card with 2x XLR in…

# Remove sound.enable or set it to false if you had it set previously, as sound.enable is only meant for ALSA-based configurations
 # rtkit is optional but recommended
   hardware.pulseaudio.enable = false; # only for Gnome DE
   security.rtkit.enable = true;
   services.pipewire = {
   enable = true;
   alsa.enable = true;
   alsa.support32Bit = true;
   pulse.enable = true;
   # If you want to use JACK applications, uncomment this
   jack.enable = true;
  };

Hmm, seems that the same hardware (USB Audiointerface) on NixOS is detected as two mono inputs, while on Ubuntu 20.04 it is a stereo input inside jackd…

But why?

Got it, simply installing “pavocontrol” and adjust the soundinterface to the proaudio setting…

Thats it…