Solved! How can I connect a hifi aux to a surround sound system?

Solution
If the Panasonic has a line level audio output then use that.
If the Panasonic has speaker level output then get a speaker to line level converter and connect that to the surround sound.
If the Panasonic has neither then you will need to get inside the cabinet and connect the speaker to line level converter instead of the internal speakers.
If the Panasonic has a line level audio output then use that.
If the Panasonic has speaker level output then get a speaker to line level converter and connect that to the surround sound.
If the Panasonic has neither then you will need to get inside the cabinet and connect the speaker to line level converter instead of the internal speakers.
 
Solution