 You may find CHBBPF, that means Chebychev Band Pass Filter at lower portion
of the schematic. Please open a monitor for it.  The frequency response of CHBBPF is drawn like this. This filter is to
pick up 0.0333Hz.  Let's open a monitor for another FFTMON(F_BPF).  You may see 0.0333Hz is existing but other frequencies are gone!! 
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