i have a jvc older receiver, about 5 years old, now it has 1 optical and 1 coaxial hook up, no the coaxial says (dvd) beside it and the optical says (cd) beside it, now on the back of my dvd player i have both hooked up, so when i go to settings on my receiver and go to digital in, it says 1 dvd 2 t.v and i can change it through out, but when i change it to 1 cd 2 dvd, i cant get sound through the optical cable, what is going on here? i am also using a movie supported by DTS, ive never been able to get dts to work it just sits there searching for it on my receiver.