Hello, me again!

Any ideas on how I can export a specific notation (in this case, the piano part) as a MIDI file?

I can see the option to print it in the notation screen, but can't see any option to export the part as a MIDI. I have tried "save as MIDI" but that doesn't produce anything, possibly because I'm using a RealTracks.

Help would be greatly appreciated - I don't fancy the prospect of copying out manually into Sibelius!

Many thanks

M