It would seem therefore that the 1611 uses pins 3 and 5 as input when it is a video-master, but pins 1 and 4 when an audio-master.
Could it be as simple (and stupid) as that? I’ll try tomorrow since I have one of these 4 RCA cable too or could make one if needed.
Could that mean tant you could have two sources connected to a 1611? Say Ipad on TV and Airplay on A.AUX?
Can’t wait to go out of the bed tomorrow! Exciting progress! Thanks Guy!