How does my jvc sa70bk dvd player determine whether to play the dts or dolby sound track? Do I have to manually select it in the player setup as well as the dvd? Is there a way for this to be done automatically? Does the dts sound track require that PCM, Stream/PCM, Dolby/Digital/PCM, Downmix, Compression, DTS Bass Management all be changed from dolby sound tracks??????