Tektronix Grass Valley 3000 - Manual (Page 251)

B-11
Keyframe Path Control
With continuity set to 1.00, the entry path through the keyframe is
pulled to point at the following keyframe or exit path. The effect
of 1.00 continuity is that of motion dropping into and then out of
the keyframe, similar to a bouncing ball (see Example 5).
Example 5
Continuity = 1.00
KF1
KF2
KF3
+1.0
-1.0
-1.0 +1.0