Wow its clearly a MIDI file issue. Bill put me on the right track and I can see how you would not see this as I do.
So to recap First thanks to Bill and Fast Biker Boy I have tentatively found the problem.
Its loading MIDI files as native files that has this problem. It should work but it doesn't. You can change all the outs via the widget in the header but not in the inspector.
Thank you both for your persistence and help.