The main control plate is basically your standard tone/volume for both pickups.
The hexagon control plate is on the left (looking head on) a bass cut witch, bridge pup switch, neck pup switch.
The top control plate is the the rhythm circuit, turning the circuit on cuts out all of the settings used for the lead circuit (Including main control plate) and uses the neck pup on its own.
Then there's rollers which control the tone/volume of the rhythm circuit.