I to have been used to sync with just about all the videos that I make because I always use a separate audio recorder in wav for recording bands and (if I can) put a flash drive in the mixing desk (as long as the sound man knows what he is doing) ! I also normally use at least 2 cameras with one fixed and often 3 with 2 fixed depending on the venue (and space available) as tripods often get kicked by over exuberant dancing !
I don't bother using a decent separate mic on the hand held camera as I constantly move about that obviously alters the sound from different speakers. The only problem that I sometimes have is the waveform on the timelines is completely different visually between MP3 and wav so I have to use headphones to get it exact.
Sometimes when it is loaded onto YouTube it is rendered by them actually out of sync !!
And I also noticed that Eric's video was dubbed, the wind blowing the plants was a giveaway. Next time add a small amount of wind noise on the track and we wouldn't have noticed !!!!!!

Yes I do convert between the two and if It's all my recordings I am ok as I have been doing it for years. However the problem sometimes arises when I use someone else's audio recording that is sent over the internet, depending on what rate it has been recorded at can make a fair bit of difference over a 3 minute song and I have to do a bit of test converting with kbps to get it right especially with 3 or4 timelines.
As for wav being much larger, compared to video they are small so it doesn't really matter and I don't bother to keep them anyway.

That's amazing Alan .. what software did that?

I say it again .. amazing ..

Dialogue replacement is easy compared to reducing background when taking "live music sync sound". 

I'd say you already know that a sound mixer and as many separator mic's you can get are the best way to control the background sound.   You want some of the audience sound, don't you?

This is confusing.  What Alan did -- and Gordon did too -- was to use the "looped" footage to extract the piano background.  The challenge would be to extract the piano on the original footage and sound.  The "looped" section of the footage I original posted uses a different piano recording for background, and of course, a much cleaner and stronger voice track which was dubbed.  So the "looped" section has the dubbed voice recorded separately and a "canned" piano track mixed with it.  No live sound at all.  As I said the challenge would be to extract the background piano from the original "live sync sound" track.  Hence no dubbing or "looping" involved.

Get it?

Confused?

WOW.  Pretty good.  It doesn't sound natural -- but it is clear and not a hint of the piano.  That means separating those piano frequencies or something. 

What's the software?  Same as Alan is using?

WOW.. Double wow Gordon  .. sounds great that way .. proves it can be done.  You've had some practice at this. And it proves me wrong when i said that "we're going to have to loop this entire section" .. Good stuff to master as SOUND IS IMPORTANT.

That's the idea Alan .. sounds much better as the ambient sound covers some of the harshness as the dialogue punches in

.. No doubt about it, the "removal" software that does this sort of thing has improved, apparently due to A.I.

That's good, nice bit of filming and editing, flows well

Apart from bands and wedding videos I don't tend to make many videos that would appeal to many others. We came back from Spain on Tuesday and as the weather has started to buck up today in the UK  I had a look around the garden at the flowers. I normally try and do time lapse of the plants opening but they are not that far advanced this year.
This is a short film from last year that I made at a similar time from still images that I took off of my camcorder.
https://www.youtube.com/watch?v=lzESpcoWgpI