James Boddie

There is also this: Game tools for terrains [www.sidefx.com]

Make sure your size parameter field matches the size of the longest side of your terrain (in meters).

The animation editor pane allows you to see a graph of how each channel behaves between frames. The default is to ease in and out of each keyframe and this is the change in velocity that you are seeing. On the right side of the pane, you can change this to a constant slope for selected segments.

See:

The Animation Pane Graph View [www.sidefx.com]