Open a monitor of INTPL(U_0). This is an interpolator.

This interpolates a "zero" between each data. Therefore, the
rate becomes 44.1kHz (M = 2).

Open a monitor of TXTOUT(U_6) and see how it changes.

The rate becomes twice higher than before because of interpolated zeros.

Open a monitor of FFTMON(U_4) and see the spectrum.

The rate becomes 44100Hz and the nyquist frequency becomes 22050Hz. The spectrum
we need is 0 to 11025Hz. Let's remove the spectrum higher than that.

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