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9.99 kHz:

8.00 kHz:

6.00 kHz:

4.50 kHz:

2.40 kHz:

1.00 kHz:

0.50 kHz:

0.25 kHz:

0.10 kHz:

Now let's turn on sharp filtering (set user option 32 to 0 instead of 1) and see what happens:

0.50 kHz Sharp:

0.25 kHz Sharp:

0.10 kHz Sharp:

The cutoff is definately very sharp, although listening to the audio, the ringing and phase delay are very annoying, with that characteristic "watery sound" of too much filtering.