Some pieces will match, more or less, of course, but with the framerate differences, it will still be a problem. But also, remember the IK soundtrack was probably not recorded live for the cd. I know that the frame fate of the BR is at 24 (23.976), so, try to see if there is a way to get the original stream unconverted (use tsmuxer for that as a m2ts file) and open it in vegas. See if there's a difference with the IK soundtrack. I'm sur a great deal of your trouble will be solved. One more thing, be carefull with the noise reduction with the vhs sound, if you over do it, it'll be crappy, but the vhs noise ca be distracting if you try to match it with the music. That's why I recommand to get the LD collector's edition and it's bonuses.