I posted this problem some time ago and didn't really get a solution
I am running FCP V7 with Decklink Extreme HD.
The problem I have is the audio is about 3 frames out of sync ( audio comes first )
This is across the board with my connectivity, including HDMI out to monitor which obviously should be perfect sync.
I can't find a sound offset anywhere, there is only frame offset in FCP which doesn't help me as it only adjusts the visual on your computer monitor and not the sound.
I am having to shift all my audio forward by 3 frames which is a nightmare !
Any help really appreciated