Thank you for the replies.
Yes in most cases, I am trying to re-time, and reedit the video to match the audio.
In some cases I would like to use 12"/remixed audio which I have edited in Logic Studio to replace the Music Video's original audio.
In some cases I use my own edits & remixes. Most of the time it will be original audio version from cd.
I am doing this for my Music Video DJing ( Video DJ ).
I need to remove all conversations and other unwanted audio to make it music only in the music video.
I am also trying to have the highest quality audio I can get, on to the music video to perform it live.
In some cases I enhance, extend or edit and remix the audio.
Most retro music videos have got very bad video and the audio is worse.
I am a Logic Studio user and I just got FCPX over all other programs available out there.
I thought there must be an easy way on Final Cut Pro but now I could only purchase Final Cut Pro X.
I guess I have to go the heavy editing route in Final Cut Pro X.
There are many tutorials for Vegas Pro available though and I know users who do what I want to do all the time.
I am thinking now maybe it will be easier in Vegas Pro.
I must have a look at Avid and Adobe Premiere and other programs to see if there is one program that is easy to use for this purpose and delivers hight quality audio/video.