Dan -- Two years ago I wrote some command line tools for editing RIFF/WAV files. You can mix, fade, silence fill, and chop files. I have not looked at these since then, and I don't remember the details about different file formats, but I will send them to you and you can try them out if you want. Untar and make. There is a document that describes how to use them. Let me know if they work for you. -- Al