 By the way, you might have found a separated component CHBBPF (U_5). Let's
replace the LPF with this BPF.  In order to see new result, please "Save" the schematic every time you modify that.  See the result of FFT (U_3) has changed. Because of BPF, only 3kHz remains.
 See WAVEOUT is 3kHz of sine wave. 
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