Confusing Volume Display

[odbod]

Ok so there's a wedge shaped volume display on the interface. By default it's at 100%, that's half way along the wedge, so you can turn it up to 200%, then I find if I use my mouse wheel another display shows up that is half full, it's a vertical white bar. So I can turn that up to what? 400%?
As far as I can tell this is just stupid. Or is it me? What's the point?

[posix]

i also find it a little confusing.