Controlling the sound in iTunes!
You can easily control the sound in iTunes by simply scrolling. It works if you have a Mighty Mouse or a scrolling trackpad because you have to scroll horizontally. It will let you control the sound adjustment that is in the top bar, in the left corner, at the right of the back/play/next. It only works when the mouse is right on top of it. So instead of clicking on it and dragging it, you can just scroll. Here is an example (at the beginning and the end, it works because I am right on top of it):