Hi Marlaina, and great to see your name again. Haven't crossed paths with you since CSUN 2003. The Book Port only supports format four, and the last word from APH was that it would likely be that way for the foreseeable future. Format four is MP3 compression, while the other three formats are not. I'm relatively sure, however, that someone on the APH staff will address that part of your question Thursday or Friday. Happy reading! Jeremiah Z. Rogers, jzr@xxxxxxxxxx