Anyone give me guidelines on files sizes for audio books in MP3? What's the average roughly speaking? Is there any correlation or equation between text file size and audio file size? This is in connection with relative size and usefulness of various portable audio devices I'm looking at. Cheers now. Ian http://www.bbc.co.uk/ This e-mail (and any attachments) is confidential and may contain personal views which are not the views of the BBC unless specifically stated. If you have received it in error, please delete it from your system. Do not use, copy or disclose the information in any way nor act in reliance on it and notify the sender immediately. Please note that the BBC monitors e-mails sent or received. Further communication will signify your consent to this.