Stereo Tool

Something wrong with the uploads .

Oops - it would probably have helped if I had uploaded them. They are there now!

After looking at this Gamma stuff, and listening to some presets with the old (classic) Multiband compressor, I might be able to come up with a new compressor type that uses a lot less processing power, sound might still be good.

What surprises me - and somehow I never noticed this before - is that the old MB, even though it runs in feed forward mode, didn't really have any pumping issues that the new one has in feed forward mode.

The old MB release was equal to the new MB's release with Gamma set to infinity. Attack was very different from the new MB. I'll look into it - after releasing this new version.

Another strange problem : When i go to the sound cards to restart them i saw that synchonize is disabled. So enable it . And when take the slider for resampling quality to the max -> hang -> cannot close it . Every time i try it, it happens .
Just go to the sound cards section-> input and after start take slider to the limit of 128 . Result: Hang

P.S: i think i see some CPU load reduce , may be a few %

Do you want for the new MB actually still generate the "default preset"? So far, the new MB is included only in presets from users. I think that many who find the product around to play only once with the factory settings. (For example, I at that time began with the built-in presets, such as web radio stereo because these were impressive at the time). This is perhaps an idea.

Oh, what I also noticed. When I compare now the build-in presets with a few user settings of the new. Here, notice the following: The new compressor, has much more "high notes". This is especially noticeable when playing one and the same music on different speakers. If I set the limiting the new compressor, the sound is a little better. But I need to change something in the mix yet, so the heights not given a high priority. In the car, these heights have very disturbed when listening. Compared to the old compressor that sounds really better in the car. But the new compressor compresses it even better and gets more out of it. I'm still undecided as to whether it is in the settings, or if the sound is another principle.

Would it be too early to ask, again, about removing the extra loop iterations?

Compare Beta 10 vs Beta 13
Beta 13 has more clear vocals and highs but Beta 10 has better mid bass in my ears.! Pls anyone else check?

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Are you using the Gamma settings?
Or Natural Dynamics?

I've been testing, thinking, creating new versions, talking with Bojcha who did lots of tests... And I think that the new compressor changes are good in one way and bad in another.

With Gamma, small differences in level are quickly compensated, with helps with a lot of things. But... Big differences are less quickly compensated. Why I think this is bad? Well, say you set the attack speed fast enough to reduce the level without hearing an audible quick level drop (which leads to 'clicking'-like sounds when a new loud sound starts). Point is, the speed at which the level gets lowered must definitely not be longer than for small differences.

For release, especially large differences must be compensated very fast - for 2 reasons:
- Big differences mean very dynamic input, and for more dynamic input it's good that more compression occurs.
- If you have a loud sound, and it takes multiple seconds for the level to get back, that sounds really bad.
- If speeds for different level differences is not equal, then for multiband compression, different bands might come back at different monents which leads to very bad effects.

So, the time it takes for the level to be restored must be constant - and the same is likely true for attack speeds! And hence the current 'Gamma'-behavior is bad.

Now, that doesn't mean that we should do nothing. Because especially for large differences, when the volume comes back at the same speed, it actually *does* take a bit longer before you don't hear anymore that the level is lower.

Example:
- Sound drops by 4 dB. When 3 dB has been restored, you really won't hear much difference anymore in level.
- Sound drops by 40 dB. Now, when 39 dB has been restored you really don't hear much difference anymore.
So in one case when 75% restoration is there we're good, in the other we need 97.5%. And since - without Gamma - the behavior is asymptotic, reaching 97.5% takes multiple times as long as reaching 75%.

Preliminary conclusion: I need to make sure that the time it takes to get to - say - 1 dB from the target level is nearly constant.

What Gamma does to small differences is that it speeds up reaching the target level. Which is good after a large jump, but makes sound more aggressive in other cases - and that can only be compensated by increasing attack and release times, which makes the problem worse!

So, and I'm welcoming other suggestions, but here's what I managed to think of so far:
1. After a big volume change, the speed when reaching the target level must stay higher than it would normally be
2. The speed at big differences must be increased further.
I think 1. is better, because 2. means really really fast speeds at big differences, which would probably lead to other issues.


Edit: I just read somewhere that some compressors don't use attack and release times but slopes in dB/s, which means that they *do* use a linear behavior. I still think that it's bad though...


Edit #2: People have already reported positive results with the current Gamma implementation, which basically breaks everything I've said above. But, Gamma also reduces recovery time after big drops (recovery starts slower but ends faster). I have 2 conflicting ideas here.
For big differences, I think my description above applies and we need a very fast level change.
For small differences, I'm not sure. If I take my "constant time to reach approx. 1 dB difference in level" approach, that would mean that very small differences would almost lead to a stand-still. The good news here is that audio with little dynamics will be changed less.
On the other hand, for small differences a constant speed (linear response) won't have the bad effects described above. But it does call for longer release times as described above, which leads to all the other issues again. So...... I think a near-standstill at small differences is probably ok.

Weighing all this, I'm leaning towards something where a fast volume change "pushes" forward. The best analogy is driving a car.

If I have to drive 10 meters, I'll just barely hit the gass and drive very slowly.
If I have to drive 1 km, I hit the gass and speed up (this is 'release hold'), then release the gass and let the car roll slowing down towards the end.
In my new idea I would not release the gas until I'm very close to the end and then hit the brakes to stop.
So basically, once we have speed, my new idea comes down to keeping that speed even if we get closer to the destination, instead of slowing down gradually.

Ow this is nice. Done correctly, this could lead to a linear release speed which still depends on the level difference - so it's linear, but faster if the difference is bigger.

Same preset, with natural dynamics... Gamma on MB? i think on default.

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