I had my cable go into my Denon receiver which connected to my Comcast/Xfinity cable box which went out to my Sony smart tv. I was able to run the sound through my stereo speakers. But when I would use a third-party streaming app (such as HBOMax, before it became available through Comcast), my stereo speakers would run only the soundtrack and background sounds, and not the dialogue at all. Recently Comcast sent me a new cable box to allow me to get Paramount+ as part of their service. But now ALL the channels only allow background music/sounds to go through my stereo speakers. I would appreciate any suggestions on how to correct this.