Apple Final Cut Express HD: Getting Started - Manual (Page 81)

Chapter 5 Editing With Audio 81
Using iTunes to Convert Audio to the Right Format and Rate
Final Cut Express HD does not currently support variable bit rate audio files such as
MP3. If you want to use an MP3 audio file, convert it to an AIFF file (which has a
constant bit rate) using iTunes, and then import the AIFF file into Final Cut Express HD.
To convert an MP3 file to an AIFF file using iTunes:
1 Open iTunes.
2 If you haven’t already done so, add the MP3 file you want to convert to your iTunes Library.
3 Choose iTunes > Preferences (or press Command-,).
4 Click the Importing icon at the top of the dialog.
5 In the Importing dialog, choose AIFF Encoder from the Import Using pop-up menu,
then choose Custom from the Setting pop-up menu.
Click the Importing icon.