The E20PB serves as a preamp unit that can be switched on or off with need. A preamp is a device that boosts the output signal of your guitar to a level that is more appropriate for mixer inputs. It also incorperates a high and low pass filter, or bass and treble controls. Bass KnobControls the amount of low end frequencies in your output signal.Gain KnobControls the amount by which your signal is boosted. Treble Knob Controls the amount of high end frequencies in your output signal.Pedal Information: Suitable for Guitar and Bass Runs on a 9v Battery that is includedCan also run on a 9v ac adapter (please check our store) Single Input and Output (1/4" Jack)Heavy duty metal casingRubber sole to prevent slipping Although these pedals are designed for electric guitar, their analog design makes them compatible with most other electric instruments, including microphones.
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