On my Magnadyne, the TV audio outputs are connected via RCA connectors to an input on the Magnadyne - Aux 2, I think. When watching TV, if I switch the Magnadyne to that source (again, Aux 2 I think) the TV audio plays through the Magnadyne. Best to switch the TV to Speaker Off and fixed audio output (otherwise volume control on TV will effect input to the Magnadyne - to high and noise; too low and no sound). I think BClemens has posted a video demonstrating this.
2012 Solera "S"
Calif SF Bay Area