Input Level provides muting and level adjustment for the input. Output Range selects the Low, Low-Mid, Mid-High, or High frequency output. Frequency selects the filter cutoff frequencies for the selected output. Output Range & Frequency may also be selected by dragging the cursors shown inside the graph. Filter / Slope selects the type (Linkwitz-Riley or Butterworth) and slope of filter used at the associated Frequency. Output Level provides muting, level adjustment, & polarity reversal for the selected output. Sync forces filter adjustments on adjacent outputs to be linked. Settings for each output are displayed across the bottom of the dialog box.
Right-clicking over certain settings will provide a menu of additional options.