I'm having trouble finding the DD and DTS soundtracks on the DVD-A disks. Using a Panasonic RP-82, when the screen comes up or I select the menu I only get the DVD-A surround or 2 channel options. The disks claim DVD-A 6 channel, 2 channel, DTS, DD. (4 ways to play) I cant find the option in my hardware to be able to access the DD and DTS and changing audio while playing only gives me the 2 "Advanced Resolution" choices. Any help much appreciated. RP-82 connected to a Denon 3803. 6-channel Ext. in and Coax digital connected.