I have a Kenwood VR-507 reciever, and a Panasonic DVD-RV30 DVD player. I can not get DTS to work with my DVD's that have DTS tracks. I am using AR optical cable to send the audio signal to the reciever from the DVD player and can not get DTS to work. On Gladiator, when I go into the menu and choose DTS under sound options, no sound will play through the speakers. However, Dolby Digital works just fine. Thanks.