Sync audio for only part of video

[cg2916]

I am working on a video where the audio gradually gets more out of sync as the video goes on. I have already tried ConvertFPS() and it doesn't fix the problem. It doesn't become noticeable until about 60% of the way in. How do I make it so that I can apply an audio delay for only that last bit of the video?

[StainlessS]

This thread might be of interest.
http://forum.doom9.org/showthread.php?t=165373

EDIT: Mainly from post #21 on page 2 (with standard settings), but earlier posts give a little background.

EDIT: OR here using TimeStretch:
http://forum.doom9.org/showthread.php?p=1552738#post1552738

[lisztfr9]

#A=Trim(115137,115237)
#B=Trim(115237,115837).DelayAudio(-10)
#A+B