Hi Signals - Brilliant work.
Been experimenting and having fun with "merge" since your help the other day.
One thing to note..... If you are using your optical drives as sources, ie. 2 discs to 1 without saving to HDD, make sure the last selected source and target drives are the same. If not, you are promted to insert writeable media and the process will not start. Obviously you cannot insert media as you will lose that source info.
Thanks again Signals for your efforts and also to Fengtao - incredible product.