A 6-band parametric equalizer. It offers five different filter types that can be individually selected for each band, as well as settings for center/cutoff frequency, Q-factor and dB gain. The available filter types are: Lowpass, Highpass, Peak/Dip, Shelving Low and Shelving High filters. Each filter band can be boosted or attenuated +/- 18 dB. A master output gain setting with a range of +/- 24 dB is also provided for normalizing the signal amplitude after filtering.

In addition, fx:equalizer features a visual filter graph, which accurately displays the frequency curve resulting from the current parameter settings. Using numbered markers to indicate the position of each filter band, the graph can be edited in real-time using simple click-and-drag mouse movements. This allows you to easily shape the desired frequency curve without entering parameter values manually.