I've just obtained a chinese Hohner Cajun box, and that didn't come with instructions either. Probably a good thing, too, as they would have been written in pidgin/gobbledygook. But I have figured out what the little buttons on top are for.
The nearest one (for right handed users) converts all the buttons on the side to *black notes* (i.e. Louder)
The next is for Cajun Dance (louder still)
The third is for sea shanties (bloody loud)
The last one is the solar power button, which only works in Louisiana or certain parts of China.
I removed that ones innards, but kept the button so as I can hang my teefer (triangle to you) from it.