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This is my new idea. The middle pickup is not a central hum cancelling pickup like on the T-Bass. This is the third pu. for the series wired mode, or work alone. It has a four position (that I didn't show on my picture, but something like on JD bass pu selector) rotate switch with four stops: series with bridge pu, off, on, series with neck pu. The reason is the humbacker sound with a J-style pickup system (like on the Fender jaguar bass). The other part of the electronic are same.