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This "boosting" of some of sounds are good for hard compressed/limited tracks. But what about good old dynamic tracks with already good matering/production? There, any "boosting" is not needed (?)
Undo is completely program dependent. So yes, if you feed it already dynamic audio, it will do little expansion. You will still find that not very much audio is actually very dynamic across the entire spectrum all at once, so there will usually be a little bit somewhere. But yes, it's program dependent. That's where its improvement to consistency comes from.
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I did hear a lot of them on the Breakaway forum (those were fed through Undo, and also through the old - SeeDeclip - declipper).
Part of that was SeeDeClip, and part was my settings being over-aggressive for the current state of several components of Undo which have also been improved a lot since. So even more aggressive expansion can happen much safer now.
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Also, at least this is my impression, even songs that have normal dynamics seem to sound better if I boost them. Which surprised me a lot.
I know, isn't it awesome how it brings out the details? When you make it more program dependent, it'll shock you even more because those details will seem to always be brought to the level where the musician *should* have had them, had they played perfectly in unison to the rest of the band. That's the best way I can explain it for now, since it's even more unbelievably... a new idea in dynamics processing for consistency. Precisely controlled program dependent expansion. Who knew?
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I do not agree that already dynamic tracks are boosted less and high comrpessed tracks are boosted more. I think it's more vice-versa.
But, we can talk about that after implementig adaptation-to-input-level. So ignore my comment.
Actually... to make it completely level independent, you need 3 things. You need average level of a band, you need peak level of a band, and you need the density of a band. Getting the peak level and density level decently close isn't too difficult. Getting it spot on is where psycho-acoustics must be used.
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So here's an idea: What if I feed the output of Natural Dynamics through an extra Multiband filter that limits the sound at the original input level. Then all the mentioned issues - way too loud S sounds, loud voices etc. - would be gone, and the original frequency content, at least that of the loudest sounds, would be restored.
That would help the AGC for sure. But the action would have to be slower than the action the multiband would ever have. So you're talking about adding a lot of delay. (i haven't checked ST delay ever, it might already be a non issue to add more?) No matter what, you wouldn't want such an effect to become audible.
My idea is to make it part of the multiband crossover, and then use the delay made up to do your natural Dynamics compensation... when it makes sense. Some songs are missing dynamics where they are also missing average loudness, and in those cases the changed spectral balance would be beneficial regardless of what sound someone is trying to get from their multiband & clipper.