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SB301 Controls

Ridiculous question, but I have a SGC Nanyo SB301 and need to know which know which control is what. There are two disconnected wires inside and it's only partly functioning.

I know the upper right knob is volume (that one is working), and I can deduce that the lower right is blend because in turning it, I can feel a center position "notch." What are the other two?

Also, can anyone point me toward a wiring diagram that would apply to this setup?

Thanks
 
Ed Goode(pointbass)traded me a similar bass(:hyper: unofficial extra positive feedback:hyper: ); he might be able to help you out. If not, I can open mine up & see if I can figure it out(I sold the bass to a friend whom I see fairly often). PM me if you need help.