I tried the AV in with my WII and DTV and didn't get anything from either of those. Possibly my optical cable is bad. I looked at the whole two sided fold out manual for my TV it doesn't say anything about the EXT link out. Also in the settings menu there's nothing to enable it I can find. I tried to do a firmware update via the Samsung site but on 3 different USB memory devices it said no upgrade detected. Possibly I already have the newest firmware available? I wouldn't be opposed to opening up the TV and pulling the speaker wires off and turning them into an output, I'm just trying to get to an RCA or 1/4" into my bedroom studio soundboard. Any info on how to do that would be cool as well.