Boss Parametric Equalizer PQ-4

The Boss PQ-4 is a parametric equalizer pedal designed for shaping the tonal character of an instrument signal. It offers four independent parametric EQ bands, each with controls for adjusting the center frequency, bandwidth (Q), and level of that band. This allows for precise boosting or cutting of specific frequency ranges, from subtle tonal shaping to dramatic filtering. The pedal also includes a master output level control to compensate for any overall volume changes introduced by the EQ adjustments. It features a bypass switch to toggle the effect in and out of the signal path, and it operates on a standard 9-volt power supply.

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