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HPF on brings less distortions on pink noise, ofc. And with that ON, (and ofc everyone will use HPF) i dont hear much difference with "test" ON or more distortions caused by bass. maybe even slighlty more bass. BAD has more bass too but also more/always distortions caused by bass.
I checked the code for "BAD!" and it would generate more highs, less bass, and more distortion in the highs. So I'm removing "BAD!" (and adding a photo of my analysis to my code archive so that next time I won't have to think so hard).
Not sure yet about "TEST". You are basically saying now that that's worse too? Based on what the code does I would expect more distortion in the mids, less in the highs.
Update: I just listened to music with ABDP in Difference mode, to hear what ABDP would do. And it's pretty clear that the mids are getting hit much harder when "TEST" (legacy mode) is turned off. I'm not as sensitive to IMD in the mids as some people (Bojcha), but chances are that this causes the mids to have slightly more IMD, even after the final stage, and to lower levels of bass and mids, especially in the presence of other frequencies (higher mids and highs). That may also leads to slightly better highs, but that's more by accident than anything else. Looking at what would be logical in the whole clipper design, I think I would lean towards keeping "TEST" (legacy) on. Other settings (highs priority, highs vs rest threshold) are far more effective to reach the same goal, and they actually make sense.
So, unless someone reports that they hear an improvement when turning "TEST" legacy mode off, I'll remove it in the next build.
Note: For the "BAD!" filter we could also change the settings, instead of having them depend on the frequencies that are already there. But I don't think that will bring much. The effect is already not big, making it possible to change the settings will have far less effect than the changes that turning "BAD!" off makes.