Compression has a profound effect on the size of the file; the more you = compress, the smaller the file. =20 Unfortunately, there is no way to split an mp3 before sending it to the = device. You might, however, be able to compress it enough for it to fit. >>> donna.slater@xxxxxxxxxx Friday, August 13, 2004 3:44:54 AM >>> 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.