It Seems like the value changes depending on what direction you're in. The code doesnt effect the X Coordinate though, only when moving on the Y Axis.
EDIT:Code:0x0000 @When Facing/Moving Left 0x0000 @When Facing/Moving Right 0x0007 @When Facing/Moving Down 0xFFF8 @When Facing/Moving UpClick to play video.
youtube.com/watch?v=sZkBQSz26To
Here's another blurry video (I seriously need to buy a camera) showing what that code does...