it looks like there are some niggling sound issues which have come about from making the various soundtracks match my original sound file.
all of them seem to drift in and out of sync occasionally by about 5 frames in some places. fixable, but annoying and time consuming, however, the image has come out bloody marvellously. I'm really pleased with it. there are again one or two spots I might revisit and fix further. after all, if the sound needs rejigging anyway, I have the time. but we are soooo close I can almost taste it.