The HPF *always* creates this chopper sound. Now if I move it to *before* Multiband, what happens when there's only a low bass sound is that Multiband drops the lows a lot, and the frequencies above it (including the 400 Hz) are NOT dropped at all - so the chopper sound can easily get 3 or 4 times louder. On top of that, because the filter is not very steep, the bass level will be increased so much that the filter is kinda useless anyway. So you get FAR less effective filtering with a lot louder artifacts. That's the only reason that the phase linear version of the HPF is located where it is in the first place - I started with it as before the AGC but that really didn't work.

Having said that, I know what the solution is - I can now completely get rid of the chopper sound using the same type of redesign that I used for the clipper. BUT to do that I need to redesign the whole Stereo Tool processing core. Which, given what I've learned in the last few days, has now moved to the top of my things-to-do list. But it's not an option for version 6.20 unless I delay the release by another few months.

Yup. And the latency can be lowered further (the biggest advantage of a bigger latency is that the chopper sound gets reduced; I'm now actually getting very good clipping result at a latency of only 3 ms :shock: :shock: :shock: