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Previously, amplitude was more of an "absolute" value in the sense that whatever value you set it to became a sort of "maximum bounce" height. However, it turns out that this approach isn't so nice when dealing with large gaps between the values of two keyframes, as the elastic easing equations expect that "amplitude > |change|" (where change is the difference in values from key1 to key2). Now, the "amplitude" value we pass to the easing functions are "|change| + amplitude". This is easier to control, as now, as soon as you start changing that value, there are immediately visible effects.