Don’t use Audiobook Builder 1.5.4 to create audiobooks on a Mac. It always adds a blank JPEG track to the audio file. Audiobook Binder 2.1 works properly and is free. No idea why LibriVox recommends Audiobook Builder. Here are instructions for getting a refund: http://www.imore.com/how-to-get-refund-itunes-app-store.
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