These days I am working on a very nice project which has to do with simple music compositing inside a web browser. I thought to use the fine SoX which can do many things with the processing of sounds. I am using it to combine sound series and then mix a few of them. I need to export the sounds as OGG and MP3 files. The OGG files will be used by most of the HTML5 ready browser and there is a fallback with flash that will use the MP3 files. Even if a browser doesn't support the OGG file it will automatically use the MP3 file.