Apple Logic Pro 7 - Manual (Page 263)

Chapter 5 The Environment 263
Logic maintains an internal list of all Environment Objects. When Objects are deleted,
their position in this list becomes available for a new Object. Whenever an Object is
added to the Environment, it is placed in the first available position on the list. (If there
are no empty positions, it is added to the end of the list). An Object’s position in the list
is its Unique ID—as long as the Object is not deleted, its Unique ID never changes.
Import > Assign by Unique ID: Objects are assigned to Objects from the source song
with the same Unique ID. (This option is useful for updating an Environment when
Objects have only been added).
Import > Assign by Port/MIDI Channel: Objects are replaced by Objects with the same
port/MIDI channel. If a match can’t be found for an Object, an Object set to port 0 and
the same MIDI channel is assigned. If a match still can’t be found, an Object with the
same MIDI channel is assigned.
Import > Assign by Name: Objects are replaced by Objects with the most similar name.
(At least 80% of the name must be the same).
Import > Assign by Icon/Name: same as above except the Objects’ icons must also be
the same.