Attached Link: http://www.philc.net/swingzone2.htm

At the end of an animation segment you have probably already set a key frame which would be correct. Now select that frame and hit the Break Spline button in the Animation Palette. This will prevent the next segment influencing the previous frames and visa versa. As an example you may like to get my free 190 frame Hand Jive pose. You can see from that how I have set key frames with broken splines to isolate each segment of the dance.