Hi Igor
1. The problem only applies to version 9. I have just tried version 8 and it works OK. In fact as I said above it is one of my normal ways of working, so it took me by surprise. I did note that in version 9 the size of the slide and music tracks can be made much bigger than version 8 probably of the order 25 - 30% bigger.
2. Have just tried another project, different images and different source of music and I get exactly the same results. What I have discovered is that if I dont enlarge the the image track and only enlarge the soundtrack (but not to the maximum size), then there is a degree of control but it is very erratic and not at all precise.
Ivor