Sorry about my last message, I inadvertently sent it before I finished writing. I would like to know if the compression on the file has any effect on the file size? Also, if I have a file which is too large for my cf card, can I split it in some way (the file being an mp3)? Thanks to all at Aph for such a superb product. I've had a bookport since they were launched and the improvements have been incredible. Best wishes Donna Slater.