Dick - On the left edge of the picture, there is a semi-circular bit missing which comntains text saying "Try It Out" and underneath "Live Demo". Clicking there runs a bit of javascript that opens a pop up window containing a selection of different types of music for it to process.
The software it runs may be too slow to be practical on an old slow computer, but it shows what can be done and may be worth noting for future reference.
I've just tried the Elite Syncopations demo and noticed that it doesn't play repeats, it moves from last bar of repeat 1 to the last bar of the second time through.

Jon - Yes, I agree that Music XML is capable of way beyond what is needed just to represent a simple melody line, but if it is going to become the industry standard file exchange format, it might be worth adopting to future proof the Digitrad. It might be worth looking for    software which can batch convert existing files to the new format.
Quack!
Geoff.