 RMZLPF(U_5, FIR Low Pass Filter designed by Remez Algorithmj is located
to remove that. Open a monitor of that component.  The frequency response is following. This can remove over 11025Hz.  Next, open a monitor of FFTMON(U_7).  Unnecessary spectrum is removed. Compare with this.  Open a monitor of TXTOUT(U_9) and see how it changed.  Quick wave is gone compare with this and the delay is due to LPF. However the volume is somewhat decreased.
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