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I just purchased a trackir4 today. The problem I am having is mostly in the pitch range of movement. I notice that by watching the tracking window, it seems as if the topmost reflector on the trackclip always loses its tracking at less than the full range of vertical pitch movement. This results in a sudden stop when trying to move the head all the way up. I have played with the trackir4 position/orientation for a while now and can not get it to track a full range of pitch from positive to negative.

You can also make adjustments in the game profiles to add more movement with smaller adjustments of your head.