AAF (Advanced Authoring Format) is used by other DAW applications such as Pro Tools. You can use it to import multiple audio tracks, inclusive of references to tracks, time positions, and volume automation.
You can export and import AAF files when Enable Complete Features is selected in Logic Pro > Settings > Advanced.
In Logic Pro, choose File > Export > Project as AAF File.
In the Save AAF File As dialog, set the following options:
Sample Rate: Choose 44.1 kHz, 48 kHz, 88.2 kHz, or 96 kHz.
Bit Depth: Choose either 16-bit or 24-bit.
File Type: Choose WAVE or AIFF.
Dither Type: Choose None or any of the four dither algorithms (see About dithering algorithms in Logic Pro).
Choose a location, enter a name for the file, then click OK.
The export includes all used regions, inclusive of track and position references and volume automation.
In Logic Pro, do one of the following:
Choose File > Import > AAF, then select a file in the dialog that appears.
Locate and select the AAF file in the All Files Browser, then click Open.
In Logic Pro, choose File > Open.
Choose the AAF file in the Open dialog.