Thanks for the try, Freddie, but those are mp3 files. I need MIDI files, so I can make them harmonize and use odd note lengths to make it idle roughly.

Ed, thanks for the info. I read the article and I have to ask what kind of set-up offers helicopter, jet plane and starship but not a motorcycle. (And a starship operates in a vacuum and is soundless.)

I'm not giving up yet.