Xnoise was ported to GTK+ 3 among some bug fixes. Also, source URI changed.
Created attachment 305717 [details] ebuild for media-sound/xnoise-0.1.31
Thanks, but it doesn't need gdk-pixbuf anymore and the optional features needed some clean up. It's in the tree now, I also updated the live ebuild which is unusable atm because it requires vala-0.15.