For each mouse event, the count of physical units moved is compared against the 1st and 2nd level thresholds. If the count is greater than the 2nd level threshold, the 2nd level multiplier will be used; if the count is greater than the 1st level but less than the 2nd level, the 1st level multiplier will be used. If the count is less than the 1st level threshold, no multiplier will be used. These calculations are done separately for the X- and Y-axis.