The master audio meter is always showed even if I uncheck the "Show master audio meter in main window".

When "Show audio meter next to inputs" is checked, all the capture inputs, even without audio are showed.
It should be very nice and clear if the audio meter only appears when the input has actually audio.
When clicking on the speaker only the real audio devices appear, the audio meters should be attached to these items.

And a little bit annoying: when clicking on the audio inputs they show a black screen in the preview.
In my opinion audio and video should be separated a little bit more.