I am editing in FCP 7 with 5D MarkII Footage, 25fps. I shot dual system so my audio is separated. I converted all the footage to Apple ProRes 422 and started to sync the files in FCP with the in points.
The problem is that closer to the in point the audio is in sync, the further I get it goes more and more out of sync.
I am not sure what can make that happen but I am providing couple of details below.
5D footage: 16 - bit Integer
WAV files - 24 - bit Integer
Sequence - 32 - Bit Floating point