Assistance with audio sync issues (and general cleaning)

[DB83]

I'll explain what I am trying to do but when it comes to tools and their use I really do not know where to start or even know whether this is possible.

I have a concert pro-shot with full audio sync but there are edits in the footage.

I have that same concert, without any edits, privately shot and the audio from that recording is in perfect sync to the pro version. The only problem with th audio is that it is not very distinct as it picks up the sound from the speakers (cannot think of the right word just now )

But I also have a separate audio recording and for some reason (maybe some post processing) this is much clearer.

Ideally, I would like to use that recording with the other footage but I soon run into sync issues. I know I can slightly vary the timing of the video and this is partially successful but only for a short clip. The audio will go out of sync again very quickly.

Firstly, I am looking for suggestions of other ways I could possibly sync up this footage.

Secondly, I am looking for suggestions of how I could possibly clean up the audio from the private recording as this is already in perfect sync.

Over to you.

[AlanHK]

You could do this in Audacity.
I recommend trying the beta 1.3 version, though if it seems unstable (as some have reported) go for the 1.2.

See Audacity Wiki for guides and usage.

I assume you can export each soundtrack as WAVE.

Open your "full audio sync" track.
Basically, use that as a reference timeline.

File/Import and select each of the other tracks, they will each open in a new track below the original.

This multi-track mixing guide seems to cover most of the things you would need to do: cutting, copying, moving tracks.
Also see Aligning Audio.

Slide your new tracks along to sync with the original track. You can mute tracks so you only hear the ones you need. Zooming in lets you see abrupt sounds as peaks you can use as markers.

Some "effects" (filters) may be useful:
"Change tempo" for stretching or compressing.
"Noise Removal" for cleaning.

[guns1inger]

I would do it in Vegas, where I can easily slice the various audio clips up, move them around, apply filters and VST plugins as required, and output a single, sync'd up audio track at the end of the process. I find the combination of visual and audio cues makes this type of project much easier, and Vegas is the king for this type of editing.