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And constant bass is clipped now (?)
Ah, now things are starting to make sense.
The bass clipping should be close to what happens without ABDP - but I guess with that disabled you still don't get enough clipping at bass sounds.
What I fixed is a bug that could cause spikes to get higher (and less flag) than they are directly after bass clipping. Which may also explain the asymmetrical bass issues.
What I have
not done, but I can easily do it, is allowing more harmonics at low frequencies. This makes little difference when the bass is not constant - but if it is constant it should have a big effect.
This must also mean that constant tones are not flat enough without ABDP - but it gets better when you increase the "Dirty Bass" slider, which indeed increases the level of very deep (below 50 Hz) bass sounds by about 0.8 dB, and also makes the output look far more constant, but it doesn't work at all at higher frequencies (100+ Hz). I need to make something new for those.
27 Hz tone at +12 dB. Top: Dirty Bass at 0%. Bottom: Dirty Bass at 500%.
Oddly, I had a filter like this in Stereo Tool 3.20