Ypanning

ypanning allows you to pan, or shift, the image of a sprite the same way you would pan a ceiling, floor, or wall texture along the y axis. Values are normalized on a 0-255 scale, meaning that regardless of the sprite's size, a value of 128 will pan it 50%.

Because it is stored in the spriteext data structure, its value is not stored in savegames. It will also only work in the polymost renderer, not classic mode.