Automatic Duck Pro Import AE 5.0 (Win 64-bit for CS5 or CS5.5) - Manual (Page 15)

supports nesting, so your nested sequences from FCP will become nested compositions
in After Effects.
Be aware that audio from nested compositions may not appear in After Effects as you
expect.
In Avid editing systems, nesting isnʼt possible like it is in Final Cut Pro. Howev er some
level of nesting is available, where layers can be nested inside of effects such as
Picture in Picture. The Submaster effect is another way nesting is possible in an Avid.
When nests are present in an Avid AAF or OMF file, Pro Import AE will create nested
sequences in After Effects.
Nesting from Motion
Motionʼs architecture is a bit different than After Effectsʼ, in that every clip is always
housed inside of a layer.
Clips are the actual bits that reference content, and the layers are containers that hold
the clips. Clips cannot live at the “root level” of a Motion project, only layers can. This is
different than After Effects. In After Effects, layers are the same as clips and these layer
objects are allowed to exist in the root of the composition. There is no extra level of
separation between the layer and the clip.
This is important to understand as you work between Motion and After Effects, as
Pro Import AE will try to do what makes the most sense when it comes to dealing with
Motionʼs “extra level”.
In many cases, like in the figure below, it doesnʼt make sense in After Effects to have
the separate levels of layer and clip.
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