Thanks. That's sort of what I am doing, it was just that last close zoom that was / is evading me.
I am running a video of a set of around an hour, and replacement audio that I tried to start around the same time, but which is never exact and is then run through a mastering suite for level & fine tune.
I lined up the start pretty well, but the closer in I could get the easier it is to match the waves.
Then I throw in cutting bits of dead time between songs for guitar changes out and because I cannot select both video and replacement audio before splitting deleting a snippet and shuffling back I end up having to resync the tracks.
Still I am in a learning curve at the mo & I'm sure I'll get there sometime