Actually D2h is testing Dolby sound since few days.it was enabled mid nights in History HD,d2h music HD and d2h 3D HD.Now they testing in Star world HD(Now it is removed).M tunes HD is enabled this option(still not activated).Generally any DTH or cable tests only one HD channel after that they will enable rest of the channels.Give Dolby sound is very easy task but the problem is if they enable Dolby sound it will come who have the HT.But Noraml TVs doesn't catch Dolby sound.so PCM sound also should be enabled. during testing technicians will try to enable both options PCm and Dolby sound.it is difficult task and take time.