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The progressbar i always use (at the top) is easier to code just doing width: 100%. Diffrent screen widths can mess up the lenght if i manually put it to xAnchor="Panel.Left" x="0"
Not sure how popular this would be, and I also know you said you were (mostly) done adding new things to the screensaver, but I think it would be nice to have the rotation triggered by the next track starting. Something like "rotationPeriod=TrackLength"