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From dark_virus on 20.03.2006, 20:22:

  multiband compression?

Hi, folks! Let's see if my crappy english is enough to explain this weird situation.

I was thinking... supposing I want to split my signal patch in 2 bands (for the matter, "hi" and "low"), in order to do some weird editing, I could do it as follows:

1 - link all machines to one plugin (dummy or gainer)
2 - split the signal output in 2 patches, and link each of them to 1 "2-pole filters" respectively (so, 2 filters).
3 - these filters will have the same "nominal" frequency, but one is set to "hipass" and the other to "lowpass"
4 - these filters could be linked to 1 "arguru compressors" respectively (2 compressors)
5 - the output of the compressors will be joined again in one machine, to continue the signal patch

So, if I want to manage my bass frequencies, I could do this procedure in order to compress only my bass patch, thanks to the filter adjusted to "hipass"

Does this makes sense? Is this a multiband compression? Or the 2 compressors could mess the things up, since they're 2 different machines?

Sorry if this has been discussed before, but I was unable to find any topic.


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From Taika-Kim on 22.03.2006, 19:14:

 

Hmm, I don't see any problem in this, it's a very clever idea!

There might maybe be some issues with phase cancellation if a signal is split to many parts, processed and then combined, but you'll just have to try it out.


From dark_virus on 23.03.2006, 14:51:

 

Hi, Taika-Kim!

I've tried it before, but in an experimental way, and the result was interesting and "punchy". I didn't use it in any song yet. In truth, I didn't see any need in use it, but you know, it can be useful someday.

phase cancellation -> to my knowledge, phase cancellation is an bass frequencies issue. Among other things, it causes problems when a stereo song is played on a mono system. Is this right?

If not, how phase cancellation can be harmful to my songs?


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From Taika-Kim on 23.03.2006, 18:29:

 

Yeah, it's a bass issue mostly. It can happen every time when you combine two signals... So watch out for those bass frequencies when you mix split signals.


From minifrog on 25.03.2006, 07:03:

 

I tried something similar using two instances of "bugpass" vst filters. I am running it right now, in fact. Two wires out of Drumatic, each to a bugpass, and then each to a delay synced a different speed, so the hats and the kicks and bass drum had different syncs. I'm no expert at this stuff tho.

And BTW, there is a multiband compressor by slim slow slider. Would this fit your bill? I don't know.


From dark_virus on 27.03.2006, 21:36:

 

quote:
Original by minifrog
And BTW, there is a multiband compressor by slim slow slider. Would this fit your bill? I don't know.


Hi, minifrog!

Yes, I know slim slow slider plugins, and I thinks this is the unique free multiband compressor to date. But, it's too CPU demanding, and it tend to crashes Psycle, when rescanning plugins.

Psycle is so flexible, so we can try some unusual techniques to find interesting results.

My next goal is figure out how to do side-chain compression!


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From _sue_ on 10.05.2006, 13:28:

 

arguru's stardust is also multiband and free


From bizarro on 07.08.2006, 22:19:

 

In the sourceforge wiki there is also a "compression" article which also features some info about multiband-compression. And Buzzroom's GranComp3 is shown there, which is afaik also free.

http://psycle.sourceforge.net/wiki/Compressor

By the way (responding to your initial idea):
if you use two filters (one hi and one lopass) to split the signal, then you rely on the fact, that adding the two signals together (without using any compression) will result in the original signal. Isnt it possible, that the frequency slope will differ? For example, if the filter has a built in amount of resonance (which sounds quite silly, but who knows...)


From dark_virus on 02.10.2006, 14:56:

 

Hi, bizarro!

So many time I don't come here. Well, in fact I didn't used this technique, because I didn't need yet. But, seems a "clever idea", like our friend above said.

I'm using the built in 2-pole filter, which has a individual ressonance control. In this case, ressonance is set do zero, in order to avoid any weird effect.

Yeah! Stardust is free and an awesome tool, but I really can't understand its controls and "results". But it can be very helpful for weird compression FX.


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