Apple Motion 3 - Manual (Page 831)

Chapter 9 Using the Replicator 831
 Object: Applies the sequence animation over each element as its own entity. Object
is the default setting.
 All: Applies the sequence animation to all replicator elements simultaneously.
When Unit Size is set to Object, each replicator
pattern cell is affected individually.
When Unit Size is set to All, every replicator
pattern cell is affected simultaneously.