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Note: I've added an item to my TODO list: The bass protection filters work less good in Overlap=0 mode. Dunno why yet.
I think I do now. The highpass filter gives very different results, with phase linear filtering it filters less strong than for Overlap>0 which causes the deep lows (around 30 Hz) to be a few dB louder, and with non-phase-linear filtering, it filters at exactly the requested frequency, which causes frequencies at 32 Hz (with filter frequency set to 30 Hz) to be over 6 dB louder - and that's in the output signal, after Loudness! (It probably doesn't help that when non-phase-linear filtering is used, the filtering is done BEFORE anything else, so it's ignored also by the pre limiter - phase linear filtering is done AFTER the pre limiter).Edit: I think I can confirm this now. Without highpass filter the difference is very small (I still think that Overlap>0 sounds slightly better, but it's very difficult to even be really sure.
I also found that - due to the much less steep filter - setting the highpass frequency to 20 Hz for Overlap=0 is closer to v4.22 30 Hz than 30 Hz is. I'll have to check if I can improve the phase linear Overlap=0 version of the highpass filter further.
Edit: Did some more tests, and v4.22 does still outperform the BETA3A w.r.t. bass distortion, even if I turn the highpass filter off. Also, BETA3 with Overlap=0 has something a bit annoying in the high frequencies (disappears when Overlap>0). I don't know what's causing it. The bass distortion problem is also present in the Final Limiter if I overdrive it, which might indicate that it's a fundamental problem of the filtering method - something that cannot be solved.....
But, if I turn the highpass filter on, the difference immediately becomes much smaller.
Note 2 to self: Test the output of all the filters UPTO Loudness combined, and check if the spectrum is identical to 4.22 (or even Overlap>0) - if possible find where it goes wrong this way...
in v4.22 and BETA3A.