I have a Denon 2805 and a Mitusbishi DD-6040 DVD player

when I select Dolby Digital in the movie's setup, the Denon displays:
auto, dig, Dolby Digital
when I select DTS in the movie's setup, the Denon displays:
auto, analog
and I get no sound what so ever, yet the vid still plays.

I have the denon and mitusbishi connected with a monster optical cable...

I have had this dvd player for some time, but just recently upgraded to the denon, my old receiver was only prologic so this is the first time I am attempting to use DTS....

thanks for any help
Mike