Dolby 5.1 surround sound is being offered in Mumbai too. I am currently getting 5.1 for Colors HD, Discovery World HD, Movies Now HD, M Tunes HD and Zee Studio HD. When I see these channels with Dolby option ON, i can control the sound only with my Home Theater's volume control. STB Volume control stops working. Also Star Cricket HD doesnt seem to have any sound if Dolby Option is ON. I have to change the option to PCM to get any sound. Dunno what the issue could be...