[David Hartnett] “You have probably exported from soundtrack at 48kHz and put that into a 44.1kHz timeline.”
Actually that isn’t likely at all. Show me an Easy Setup with 44.1khz audio.
The important thing we need to know is how much is the sync difference. Try to measure how many frames you need to nudge to resync after exactly one hour so we can work out a percentage. Also search this forum for Jeremy’s often quoted solution to reimporting broadcast wav files that drift sync in FCP. Frame rates, drop/ non drop timecode and mismatched timelines are the common culprits, not sample rates.