MotionValues: With the SEGMENTEDITOR or the BLENDPOINT EDITOR, you ...CAN specify the:
CAN specify the:
CANNOT specify the: The Velocity values at the Start and End are [they are 0 units/s ] The Acceleration values at the Start and End [ they are 0 units/s2 ] The Jerk values are a function of the Positions at the Start and End of the segment, and its duration. 

Segment Parameters.
Notes: 0 ≤ StartFraction ; 0 ≤ EndFraction ; 1 ≥ EndFraction + StartFraction. If Start Fraction + End Fraction < 1, there is a constantvelocity. You cannot specify the value of the constantvelocity. If Start Fraction + End Fraction = 1, there is not a constant velocity. If Start Fraction = End Fraction, the segment is 'Symmetrical' If Start Fraction ≠ End Fraction, the segment is 'Asymmetrical'. 

Examples of Start and End Fractions SegmentParameters
Applications Notes
This might reduce the pressure angle. However, the peak acceleration will increase.


Asymmetrical Motion 
ASYMMETRICAL MOTIONThe segment is asymmetrical when the StartFraction ≠ EndFraction In the image, the:
Thus, there is not a constantvelocity between the start and end fractions. 