# Curve Type menu

Use the Curve Type menu to select how you want to control the velocity of scaling changes. You have two options from this menu:

- Spline: Select this option when you want to control the scaling changes by manipulating the shape of the plotline.
- Velocity-based: Select this option when you want to link the speed of your scaling changes to the speed of the peg, which is controlled by the Velocity function tab.

See Also
Editing Functions in the Function Editor
Adding Keyframes and Changing their Value
Reshaping the Plotline in the Function Editor