wurlitzer student piano

[ssseals]

I just bought a wurlitzer "student" piano for real cheap and am wondering what the differences are between it and a "real" wurlitzer elect. piano. It's got speakers under the keyboard built into the stand, and a knob under the keyboard that doesn't work that says something about piano sounds 1-6. Is this a feature I should look into fixing? Does anyone use one of these? Anyone know of a website that I can go to to get info? It sounds good. Thanks.