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The Filter effect adjusts the tone of the audio signal by filtering out certain frequencies.

Effect Variation - The type of filter.  Low pass filter (-24, -18, -12, -6 dB per octave ladder filter), high pass filter, band pass filter, notch filter and comb filter.

Frequency - The filter's cutoff frequency.

Resonance - The amount of filter resonance (feedback).  For the notch filter, it controls the bandwidth.

Overload - The amount the filter is overdriven.