Newer versions of Windows Media Player allow the viewer to adjust the sound and image quality to enhance the video. For example, some videos have a "rumble" in the sound track due to air conditioning: reduce the lower sound frequencies. Or some videos may seem too dim or bright : these qualities may be adjusted. It is possible, with effort, to make such alterations a permanent part of the file, depending upon the viewer's tastes. Original videos were done on half-inch analog tape, which will probably be unreadable by about 2010.