okay, the 2 TV scart sockets are in use but I see it has the red and white phono sockets, and on the theatre system it has 3 pairs (left and right) of red and white sockets. the first 2 pairs are marked "in" and the 3rd says "out".
so.. in or out? (I know I could suss this for myself, but if it doesn't run smoothly, like most things I do, I could eliminate the obvious!)