Hi Sam,
If your sync audio problem appears to be on ALL clips and it appears to be off by just a few frames, try going to Final Cut Pro->System Settings->Playback Controls and taking a look at “Frame Offset”.
My first guess is that it is on 0 right now on your system. On mine, using an AJA IoLA, I have it on 4 and audio appears pretty well globally synced to video. I seem to recall something like 7 being a popular starting number, and then you can adjust up or down from that. The frame offset varies from suite to suite and it depends on how your suite is wired.
I hope this does the trick for you,
-Pat
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