How do I link my keyboard keys to control audio AND to display the according UI?

I have a new keyboard and could not control audio on my system at first. Then I found this question that let me create a shortcut to edit the volume. This somewhat works, however I would still like to have the according UI (see attached image) to show up as well. Does anyone know of a fix that includes this part of audio changing as well?

Solution 1:

Don't use the shortcut that you have setup remove them and then

Go to settings -> Keyboard Shortcuts -> Under Sound and Media

You will find Volume Down , Volume Up and other shortcuts disabled by default you can select your shortcut key here and it will work with along with the GUI

These Settings here