Custom Solderless P Bass harness, Alpha A250k solid shaft pots. Mid control Tone pot. This gives you 3 different sounds. When the pot is in the middle it bypasses the other two settings giving you your natural sound. If you turn it up it boosts the mid frequencies and turned down it scoops the mids. This passive no battery needed. It's all wired with a Switchcraft jack and comes with a diagram All items made to order , 5 business day shipping time Items that have been soldered on are not returnable, please contact me if you have a problem oncean item has been soldered. All pots and switcheshave been treated with a conductive lubricant to prevent moisture damage andcrackle in the pots. I don't like to borepeople with my life history but I have been playing guitar and bass for over 30yrs. My father was also a guitar player and his band opened for theAllman Brothers , Grateful Dead, Jimi Hendrix, Procal Harum, Captain Beefheart,13th Floor Elevators and Fleetwood Mac with Peter Green etc. I put as muchcreativity and innovation in the pickguards that I make as possible making eachone different and adding features that allow you to get as many soundscombinations as possible.