Here are the steps to AV synchronization

[G-man]

Some kind folks wisely pointed out that it's best to add effects first before demuxing and replacing EQ'd audio in the music track. This I shall do in the future; but for anyone interested, it's still possible to sync the AV perfectly by following the steps I compiled below.

When adding a voice or music track to the Timeline
and muting the sound on the video, any addition of
transition effects in the video track will delay the
audio by the length of the transition effect. Follow
the steps below to correct the problem.

1. Find a part of the video where you can best observe
the discrepancy and determine the precise amount
of delay in the audio. Using a stop watch is helpful.
In our example, we will make the third audio file
start three seconds earlier to synchronize with the
video.

2. In the Timeline, click on the audio section (voice
or music track) that precedes an inserted transition
effect. A vertical yellow bar will appear at each end
of the section.

3. Zoom in to the point where the time ruler shows
intervals of frames (e.g., 00:03:50.06, 00:03:51.06,
etc.) and position the cursor so that the sliding
line on the time ruler corresponds with the end of
the transition effect in the video track then make
a note of frame (e.g., 3:51.36. Since the ruler is
now divided into tenths, just add ten to each unit;
so a third of the way between 3:51.06 and 3:52.06
is 3:51.36, rounding off to the nearest unit).

3. Next, place cursor on the yellow bar in the audio
track until it turns into an arrow pointing to the
right.

4. Drag the yellow bar to the left and drop it at the
00:03:48.36 mark on the ruler.

5. Now click in the third audio section then drag and
drop it to the left, so that it joins the preceding
audio section.

5. Zoom out a bit and preview the edit to see if the
audio and vidio are now synchronized. To do this you
will click on the video track icon (film reel) then
click again on the ruler, shortly before the transition
to avoid playing the video from the beginning.

6. Repeat steps for increased precision if necessary.

G-man

[etech6355]

I thought RIPPLE EDITING takes care of the audio/tracks syncing to lock all the tracks into time.
Do you have Ripple Editing enabled?

[Black Lab]

I thought RIPPLE EDITING takes care of the audio/tracks syncing to lock all the tracks into time.

I believe what he did was add a transition(s) to his project after he already had his audio in place in the music track. By adding the transition(s) that shortened his video and threw his audio out of sync.

[sjj1805]

The last set of numbers are not tenths of a second they are frames.
A PAL video will go up to 24 then start again at 1.
NTSC will count up to 28 then start again at 1.

You will find a guide to resynchronising audio and video here:
VS & MSP: Fix for Out of Synch Audio/Video

[G-man]

You guys are the best!