In Harmony, you can use expressions to automate the calculation of effect values based on the values in another function. An expression is a mathematical formula that allows you to manipulate the value in the source function to create new values for the destination effect.
For example, there are two characters. One is walking across the stage and the other is following the same path two steps behind. Without expressions, you would have to manually enter the values for the position of the peg so it is one frame behind the original element. However, you can save time by building an expression that does this for you. Then, if you change the position of the element in the original column, Harmony automatically updates the Expression columns linked to it.
|•||Creating an Expression for an Effect|