(Lever down) Leads your pickup sound to a heavy, rich tone by boosting the gain in the mid-range and reducing the low and high frequency range to even it out. (Lever center) Helps boost the harmonics in almost any pickup. It is similar to ordinary flat boosters. (Lever up) Gives your pickup crystal-clear and vivid tone by expanding the frequency range. Only small amount of current drain (0.16 mA) required that means your 9V battery will last for more than 4000 hours in continuous use. - workable voltage : drop down to 2.2 V). Includes washers & nut.
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