Alti, below is what David posted when I asked this question:
It's logarithmic volume control... it gives much better controll than the
windows linear one... move the slider around the bottom in windows and see how much the volume changes... then move the slider in the top range and notice there is pretty much no change... I now change the volume based on decibels, like professional audio equipment....
iTunes implemented it in their latest version... don't compare based on looking at the windows slider, which is linear and wrong for audio, but listen with your ears... you will notice that it's a perfect audible transition all the way up the scale now...
david
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