Ibanez MC-300 schema

With the Tri-sound switches, each humbucker can be connected in parallel or in series. It is also possible to use only 1 single coil, so that it becomes a "single-coil". With the 6-position rotary knob, one of the capacitors that has an effect on the tone can be switched on.

The 2 black switches at the bottom left are the Tri-sound switches. The rotary knob at the very bottom is the 6-position selector knob. Furthermore, as usual 2 controls for the volume per element and 1 for the tone. Top right as known the selector switch for the elements. The photo below is of a 1979 Ibanez MC-300.