Using the Filter Viewer GUI (figure 4)
the user may interactively see how the design
look like. The GUI is opened from the main GUI
by clicking View below filter variables.
Keep the Designer and Viewer windows open at the
same time and do some changes in design.
This tool is meant only visualising filters in several ways that are named in the check boxes in the left. There are plots for magnitude and phase response (default), group delay (derivate of phase), zero-pole-diagram, impulse and step response of the filter.