There is no need for this faceless application to be running continuously in the background, as the developer suggests, as long as you have DragThing. The application will launch when you drop the first sound file onto its icon and will stay open for ever in the background. However, if you have DragThing you can drag the file onto its alias in the DragThing dock and then you can easily quit it in DragThing after you're done with it.