Maybe . . . I suppose I'm asking two questions really: Firstly, given two clips of similar though not exactly the same length (approx 59 minutes) both 16bit 48K audio and both recording the same event, one being camera audio and one Zoom H4 audio, does FCP X do a reliably accurate job of syncing them? My experience so far is that it doesn't. I question whether this is because I went from the H4's original MP3 recording to 44.1 (an accident because its my default Logic setting) and then exported to 48K. Or if its because there's so much traffic noise on the camera audio that FCP X is having problems even recognising them as containing the same audio. Hmmm - answering my own question sort of - there's a point early on in the audio where the speaker coughs. This is relatively easy to manually sync to using a couple of markers, one on the video and one on the H4 audio. However despite this sync being pretty precise, ater five minutes its falling out of sync very slightly and 10 minutes in it's quite noticeable. So something's not right, but I'm foxed if I know what! The second question is more about best working practice assuming I have to manually re-sync the audio. Given the above I'm looking at having to find roughly 12 points in an hour of movie (5 minute intervals) at which I can marry up the H4 audio to the video, I'd appreciate any tips you guys may have on doing this as efficiently as possible. For example I wish FCP X had something like Logic's Locators so I could easily cycle a chosen section of the video! cheers and sorry this is so long!!