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YOU can use filter pedals to either accent or quite literally filter out particular frequencies of a sound. Think of a filter as a door that only lets certain frequency ranges through.
Low- and high-pass filters allow the low- and high-end frequencies to ‘pass’ respectively, while a band-pass filter works within a predetermined frequency range and filters out the low- and high-end frequencies either side.
The EQ on your amp is essentially a series of fixed filters, sculpting the shape of your tone without movement. However, it’s when you start shifting the frequency range in which the filter is operating that things get interesting.