Hi..
I`m Peter, an experienced audio-related freelancer.. I did similar projects in the past..
In my studio I have professional tools from Sony-Vegas, Audition, VocSync,Melodyne specially designated for tasks as yours, I have another profi software sets as Izotope, Melodyne for do all post-production work to get audio to top quality (depending on your sources recorded)
From you I`d like to get your source video track, and audio/the best as separate wav, or hi quality mp3/ - then we can start..
pls ask if you have any questions to answer..
rgds
Peter
I tried to get your file from dropbox link - but got error message - "this file is no more present here"