Bingowings said:

I was watching the edit playing through a media enclosure and in Stereo (I don't have a 5.1 set up) so presumably that and the NTSC image is creating some of the technical problems I'm experiencing?

Yeah, I had issues with the stereo as well. I had initially edited some scenes with headphones (see here: http://www.youtube.com/watch?v=zlCszi46i8c) but then when I went over it again in surround, the music bleed from the original track was much too obvious and I was able to get rid of it by putting the new music over all but the main speech track with higher volume - which sounded fine as it was on an isolated channel - when watched in stereo though, the music comes out too loud.

And are you using a PAL player? That could make sense. It's a damn shame though... At least I know what to be aware of for the next two and for the HD version of this one. :P