I have a Panasonic DVD-RV41 and a Sony HT-DDW830 Receiver. The DVD does not have a DTS decoder but does have DTS Digital Out, my receiver has a DTS decoder. I have them connected with an optic cable. For some reason I can't get audio when playing a DVD in DTS mode (Saving Pri. Ryan in this case). The DVD settings should be correct, PCM Down Conversion is set to YES, DTS Digital Surr. is set to Bitstream. The input mode for the Sony is set to Digital Optical. Sometimes the receiver shows the word UNLOCK, I can't find any information on this. When I press (Multi Ch In) I get only Left and Right sound. When its off, I get no audio at all. Everything seems to work fine in Dolby Digital. My DVD does not have a Digital Coax Out, so that is out of the question. I have tried more than one Optic cable, don't think that is the problem. Any help will be greatly appreciated. Especially anyone with experience with this sony receiver. Thank You.