What does "TV Ratio" under my HR24/100 display settings do? Mine is set to "Standard 4:3" but my 720p, Widescreen, 16:9, TV seems to operate fine, with full HD. My DVR video display settings are Native "On", Screen Format "Original Format". All of the TV Resolutions are "checked on". Does this trump the TV Ratio? If so why have the "TV Ratio" setting?