I've been messing around with the thing, I certainly wouldn't call it "playing" around. The strings, when all tuned to G provide the proper notes for the C major scale. There are not enough keys for the sharps to provide all the sharps you need between the naturals. I managed to bang out a passable "Go Tell Aunt Rhody" which sounded strange with an Asian sound.

Thanks for looking, gang. If there is anything more out there I hope someone can stumble across it. The instrument is too bulky to carry on The Big Trip but I will bring it along on future trips if I can tame it and make it sound good.