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Under Windows and Linux, the mouse scroll wheel seems to be linear. Under Mac OS the scroll wheel some sort of acceleration which means it either goes too slow or too fast.

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"it either goes too slow or too fast" another brilliant design element brought to you by Apple. Yay Apple. :( – Lemmings19 May 14 '12 at 14:46

USB Overdrive does this as well, and it is shareware. It can also remove the acceleration added to mouse movements.

enter image description here

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Apparently SteerMouse lets you change scroll wheel settings but it is not free software.

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I've tested this and it works great for changing the scroll wheel for linear motion. – Nick Sonneveld Oct 19 '10 at 4:46

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