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Run the ControlExample and select the Scale tab. If you hover over the Scale (Horizontal) with VoiceOver, it will read that it's 0%. If you change it to a vertical scale and hover over it, VoiceOver will read 100%. Change the selection box to 100 (the scale will move to the bottom), if you hover over the scale, it will read 0%. It's reading the value "inverse" of the selection value when it's vertical. By the way, it says that it's a "Slider". The slider widget will say it's a "Scrollbar"
The behavior is correct on Cocoa, so this is WONTFIX. The use of "Scale" vs. "slider" can't be helped -- we're reporting back what Cocoa says is the role of the control.