Thanks, I'll try that.
Yes, I'm using the main video timeline as I've only just started. I was thinking I might have to put in blank bits, like blank title frames, add my clip and then trim the preceding blank until the edited clip starts where I want it to. A bit cumbersome!
But I can put clips in the overlay row and they will stay exactly where I put them and play just as if they are in the main video timeline? That seems like the answer! A bit like multi-tracking music? Can you have nothing in the main video timeline?
The idea is to build the video up like a pastiche, but not necessarily from the start to the finish because when I edit an earlier clip to sync well, everything else that used to sync well shunts up instead of staying where it is and allowing me to cut the end of the preceding bit off. But if I put them in different overlay tracks, that should be achievable, unless I've misunderstood. I'll RTFM, but I just started using it and it wasn't too hard to work out the basic editing and so on, although I need help with more complex stuff.
The gaps will be filled in with other bits of video, but at the moment if I want a 25 second clip to go at 1:25 to 1:50 of the sound track, that's where I want to put it and stay there locked in place when I trim the ends off and not move about. So I can lock clips in the overlay timeline like that? Excellent!
I think I saw somewhere there are 16 overlay tracks?