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Frequency-dependent sidechain compression?

VST, AU, etc. plug-in Virtual Effects discussion

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KVRist
 
36 posts since 15 Feb, 2007, from 40.241944°, -75.284167°

Postby floydianite; Wed Mar 28, 2007 4:49 pm Frequency-dependent sidechain compression?

How do you use a sidechain compressor to duck only the frequencies occupied by the sidechain signal? Or is that how standard sidechaining works? My understanding of external sc compression is that the signal being compressed is attenuated across its entire spectrum (single band compression). For example, let's say you have a synth pad playing some chord progression that you want to duck when, say, a vocal part comes in. But instead of compressing the entire frequency range by the same amount, you want to apply compression based on the frequencies of the vocal part at any given time. If someone is singing middle C you would want to compress mostly at that frequency (~261 Hz) and its harmonics. How is this achieved?

Thanks!

edit: maybe this question is better suited for the "Production Techniques" forum... :dog: :oops:
KVRAF
 
5688 posts since 22 Sep, 2005

Postby Lagrange; Wed Mar 28, 2007 5:34 pm

Well you could use SpaceBoy.. It's not compression but will duck the way you are trying to..
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KVRAF
 
2634 posts since 15 Jan, 2005, from Ottawa, Ontario

Postby Debutante; Wed Mar 28, 2007 6:17 pm

There's a free one called IQ4 that might do the trick...

http://www.platinumears.com/
KVRian
 
650 posts since 19 Jan, 2006

Postby frog_jr; Wed Mar 28, 2007 6:33 pm

Nice link! Cool tanks!
KVRist
 
36 posts since 15 Feb, 2007, from 40.241944°, -75.284167°

Postby floydianite; Wed Mar 28, 2007 6:39 pm

TWO great suggestions, thank you! These are exactly what I had in mind. I guess a better way to describe this would be dynamic eq rather than compression.
KVRian
 
650 posts since 19 Jan, 2006

Postby frog_jr; Wed Mar 28, 2007 6:45 pm

You might want to look at Bluecat Audio's freqanalyst pro also. Pretty awesome, though not free. Cheers
User avatar
KVRAF
 
2285 posts since 7 Sep, 2004, from Paris (France)
 

Postby Blue Cat Audio; Wed Mar 28, 2007 11:59 pm

Another way of doing it is combining the FreqAnalyst Pro plugin as suggested by frog_jr and what is explained in this side chain dynamic eq tutorial.

If what you need is frequency based ducking (and not exactly compression with all the associated options), you can replace the Blue Cat's Dynamics compressor by the Digital Peak Meter Pro plugin for the amplitude detection part.

Note that from what I understood, it seems you are just looking for a reverted vocoder!
KVRian
 
1056 posts since 21 Mar, 2005

Postby Waker; Thu Mar 29, 2007 12:44 am

...Focusrite will add this to LM in 2.0, as far as I understand...
KVRist
 
320 posts since 24 Feb, 2004

Postby Rusty Shackleford; Thu Mar 29, 2007 12:57 am

Interesting! Anyone know of any similar tools for us mac guys?
KVRAF
 
5688 posts since 22 Sep, 2005

Postby Lagrange; Thu Mar 29, 2007 7:35 am

BTW that platnum ears IQ4 did not have a download link on the page.. I found it HERE..

L
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KVRAF
 
3566 posts since 26 Feb, 2004, from Paris (france)

Postby Vonbrucken; Wed Apr 04, 2007 12:35 pm

Lagrange wrote:BTW that platnum ears IQ4 did not have a download link on the page.. I found it HERE..

L

thanks i was searching like a mad on the page :lol: :wink:
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Organising a protest march this Friday Schlesische Strasse 28 ,10997 Berlin, Germany
KVRist
 
36 posts since 15 Feb, 2007, from 40.241944°, -75.284167°

Postby floydianite; Wed Apr 04, 2007 4:57 pm

ok, I've been playing around with some of the suggestions above but I still don't understand how to get the desired effect. Can someone please explain how to set up a simple sidechain between two signals? Is it different depending on the host being used?
Last edited by floydianite on Wed Apr 04, 2007 6:05 pm, edited 1 time in total.
KVRAF
 
5688 posts since 22 Sep, 2005

Postby Lagrange; Wed Apr 04, 2007 5:03 pm

Well a good place to establish how to setup the sidechain is to know your Host handles effects etc..

L
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KVRist
 
36 posts since 15 Feb, 2007, from 40.241944°, -75.284167°

Postby floydianite; Wed Apr 04, 2007 7:04 pm

Lagrange wrote:Well a good place to establish how to setup the sidechain is to know your Host handles effects etc..

Right now, I'm mainly using Audition 2 which I'm not even sure allows for sidechaining between two tracks like Cubase does. But I'm really just looking for a general explanation of how sc'ing is done regardless of the host, assuming it supports it.

After reading this thread, it seems like there's two different ways of doing this. You can use two instances of a plugin, one being the sc or you somehow insert both tracks into a bus..?? But it all depends on the plugin being used? It seems like it should be so simple but I'm really confused on this! :cry:

Btw, I'm not necesarily talking about frequency-dependent sc'ing anymore. I see now there are special plugins for that like the IQ4, space boy, etc. This is really just a question about sidechaining in general. For example, sc compressing with the sv-315 (i'm using the demo now)

Thanks
User avatar
KVRAF
 
2285 posts since 7 Sep, 2004, from Paris (France)
 

Postby Blue Cat Audio; Wed Apr 04, 2007 9:51 pm

There are indeed many ways to perform side chain control. Note that "side chaining" is a very general term which usually means using an audio signal to control/modify another one.

The most common methods are the following:
- use a multiple I/O plugin with both signals as input. You usually need to create an auxiliary bus in your host in order to send both signals to the plugin.
- use a plugin which operates with its own internal channel, with a source and a destination instance.
- use MIDI CC or automation (that's what we propose with most of our plugins, as shown in these tutorials for various hosts). It's the most flexible method for custom side chain effects.

The method you will choose depends on your host (can't remember if audition allows multiple channels busses), the plugin and the type of effect you want to achieve.

As far as compression is concerned, maybe you will find an answer in the (long) all about compressors thread.

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