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Input Jack This, believe it or not, is where you plug your bass guitar into the amp! 2. Volume Control Amazingly enough, this control determines the overall volume of the amplifier. 3. Treble Control This cuts or boosts the high frequencies. Turning the knob clockwise from the center position boosts the highs while; turning it counter-clockwise cuts the high frequencies. 4. Middle Control This cuts or boosts the middle frequencies. Turning the knob clockwise from the center position boosts the m