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That's a more subtle overall effect than it sounds like to my ears. However, it's touching stuff *way* too high in the spectrum. There should be a way to LPF that output.
I'm not really sure if an LPF would fix this. But let me quickly explain what the settings do. Adding an LPF is easy enough, if still needed.
First Softness. At a low setting, bass gets turned almost into a square wave. So, harmonics are generated upto very high frequencies. The higher you set Softness, the more the harmonics are generated at lower frequencies. The total amount of harmonics stays roughly the same though.
Strength controls how much effect there is. At 100% (0 dB), the waveform really turns into a full square wave. Reduce the setting to make it have less effect.
Lowpass frequency controls the INPUT frequency that it looks at. And here's the interesting part: If you set Lowpass very low, and Softness very high, it only creates the first harmonic. So then Lowpass basically directly determines how high the generated frequencies can get.
Which probably means that there is indeed a good use for a lowpass filter at the end: With that you can use a lower Softness value to generate multiple harmonics for very low frequencies, but not for higher frequencies. So, I'll add it. Beside that, very low lowpass frequencies (for input) tend to cause artifacts that are then copied to 3 and 5 times higher frequencies, which is bad too.
==> Done.