I am struggling to find what makes the background of the wavebar here black:
There is no 0,0,0 in the skin, but I suspect it is not something caused by the skin, since it seems the default skin does the same?
(perhaps it gets sourced from a build-in theatre mode?)
If this assumption is correct, could a new element be introduced for this?
It could also follow the auto-colouring of the albumart background, but that will probably turn out ugly in many cases.
Which raises a second question; can the auto-colouring of the background of the albumart be overruled?
If so, the background of the albumart and the wavebar could follow the same element.