I noticed it. Channels have different volume level. Star World Premier HD for example has the highest volume among English GECs.generally in HT,TS given Low volume in HD channels on Dolby mode.and when you change the channels up and low volume difference is also there.if you want to listen pure dialogues and surround sound you have to put high volume but if you change the channel on same volume then the volume will be high or low.which is one of the worst thing in TS.ADTV gives perfect volume in all the HD channels.
I am very much satisfied with Tata Sky quality. They need to work on something but the AQ and PQ is great. A way better than d2h for sure.