DisasterArea

Hello, I run guitarix on ubuntustudio 20.04 LTS and am not able to assign MIDI controllers. As described in the wiki, I use the middle mous button but nothing happens. No dialog opens and I get stuck. Ubuntu 20.04. comes with guitarix 0.39.0. I then activated the ubuntustudio backports, did an update and am now on guitarix 0.41.0 still on Ubuntu 20.04. Still it does not work. Am I doing something wrong or is it a bug? I use gnome desktop Regards Frank