On this week's MacBreak Studio, Steve Martin from Ripple Training talks about exporting roles and individual audio components from Final Cut Pro X.
Since there are no "tracks" in Final Cut Pro X, audio is assigned to "roles" as a form of metadata. The audio from any clip can be expanded to reveal the individual channels, which Final Cut Pro calls Components. These channels can be assigned roles such as dialogue, music, and sound effects. In fact, Final Cut Pro X makes an educated guess and assigns these roles automatically when you import your media. You can of course reassign these roles - and you can also create subroles.
You can then choose exactly how to export your audio components in order to manipulate them in other applications such as ProTools or another NLE. For example, you can export the audio from each mic used in a shoot as a separate track in a Quicktime movie. Or, you can export audio components bundled into roles, so that for example all the dialogue is exported as a single track, separate from music and sound effects, for replacement in markets that will used a dubbed version of your program.