Commands:Compound

compound is a non-existent command that would allow you to combine tween types.

Usage
A comment from tween.cpp gives an example and explanation:

"This interpolator combines multiple other interpolators, to allow generating more complex tweens. For example,  means 25% of the tween is linear, and the rest is accelerate.  This can be used with Bezier to create spline tweens."

However, as it is not implemented, this article merely serves as a placeholder.