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POWERING THE UNIT 1. IF YOU ARE CONNECTING MORE THAN TWO 13-PIN GUITARS, ALWAYS USE A 12VDC ADAPTER (rated 0.8A - 1.5A) WITH THE GKMX-42. 2. MAKE SURE THAT THE CENTER HOLE OF THE 12VDC CONNECTOR IS 0V AND THE SLEEVE IS +12VDC OTHERWISE PROTECTIVE COMPONENTS INSIDE THE GKMX DEVICE MAY GET DAMAGED.