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Here's a picture showing some typical frequency response courves you can create with this.
Please not that you can select the 3 modes from the Polymoog (Low Pass, Band Pass, High Pass), plus a 4th mode I would describe as "Bandpass-Notch". Odd enough, this is implemented in the original Polymoog synthesizer, too, but it could not be selected from its front panel. It sounds quite interesting, IMO. Not as "heavy" as the normal Band Pass mode, because of the nothches between the peaks. (Due to phase cancellation between adjacent BPF bands). You can easily spot which mode is wich, on the picture below:
