Input Level provides muting and level adjustment for the input. Output Range selects the Low, Mid, 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.