moar vidding woe - phantom sounds in final cut divx exports

[such_heights]

So I have had this problem with Final Cut for a few months where if I use the Export as Quicktime conversion --> export as divx option, it repeats a random snippet of the music right at the end of the vid, i.e., the song will fade out and there'll be a one note blast right at the end.

I have previously had two workarounds with this - either just open up the file in Streamclip once I'm done and rexport as an avi with the last second or so cut off, or export from Final Cut as a huge quicktime movie -- where there's no audio problem -- and rexport as an avi from Streamclip.

However! For my current project this isn't working, because however I export from Streamclip, some sections of it come up all pixellated and unpleasant. So now I am trying to figure out why Final Cut does this in the first place, but am drawing blanks. Anyone got any suggestions?