Further to last message:
I forgot to add that the ciomputers are eMacs. The oidd bit is that two students working on the sdame machine with obviously different log-ins can get it right and wrong.
I haved tried copy and paste and it makes the video go to 5:4 instead of 4:3 no matter what sequence settings I choose. And the audio sync gets scrambled. Audio with video gets shifted – the timeline indicates by one frame though it turns out to be about 5 frames when resyncing by eye. Then the in points on the voice over tracks seems to be shifted back by about 2-3 seconds.
To recap: after your instructions I simply selected all the rendered NTSC sequence, copied, and pasted into new PAl sequence and rendered. Very quick but as you can see – I will have to spend a lot of time re-editing and fiddling.
But thanks for the suggestion.