The tv is 55B7, amp PMA 680R, this is a passive amp which i am using for passive tv sound duties. Connection is line out from tv. The volume control is not active in this mode on the tv as its a pure line out than a headphone out.
On the menu of the tv there is an option to configure the magic remote for other devices. The i chose the device as a denon sound bar as integrated amps are not listed in the menu. Upon trying out few sample controls, i am able to change the volume, power up and down the amp via the magic remote. Once the configuration menu is exited, i have no clue what button on the remote lets me switch controls between tv and the amp. For example when i press the volume up button it still shows the invalid.