[Rwp] Dynamic EQ

[Justin]

Hi,

Here's a youtube link where you can see it in action for some mastering 
to add to the excellent run-down Snowman gave. Hope it helps someone,

Justin

https://www.youtube.com/watch?v=GurMDoB55EI

On 04/01/2016 00:10, Snowman wrote:
> Well, I know this list is not about such things.  But, since we were 
> buzzing a bit about this Dynamic E Q plugging, and I was flagrant 
> enough with mad money to buy it, even though I don't really need it, I 
> thought I would jot down what I have learned about it in the little 
> time I have actually had to play with it, in case you were curious, 
> just to give closure.
> This is not multi-band compression, as we all suspected.  Instead, it 
> is a toy for playing with the stereo spread of your mix, to make it 
> sound wider, or mor enarrow.
> It uses the concept of M signals, and S signals.  Such terms are 
> actually common, I guess.  But, if you are not familiar with it, the M 
> signal is the summation of left plus right.  S is left minus right.
> And, this tool is about making dynamic combinations of m and s.  When 
> just running normally, with all gains constant and at unity, you can 
> dig up your basic algebra, and use a little simple mathematics to 
> return to left and right, since
> m plus s,
> which is really (l+r) + (l-r)
> yields 2*left,
> Likewise m minus S yields 2*right.
> To support this, the tool gives you two filters.  You can choose the 
> style and frequency for each filter.  The m signal passes through one 
> filter, and the s signal passes through the other, and they are 
> combined at the wet output.  Yes, there is a wet/dry mixer as well.
> In addition, each filter has a trigger signal, which is a copy of the 
> original input, with it's own trigger filter style and frequency.  So, 
> now we really have 4 filters, two for each section.
> The trigger for the M  section is a mono signal, l plus r, passed 
> through the M trigger filter. The amplitude of that trigger output can 
> be used to either increase, or decrease the gain of the main M filter 
> band.  It doesn't sharpen the filter, it just modulates the gain of 
> that filter output.
> Likewise, the S section output is modulated by the S trigger filter 
> output.  The S trigger input is the original l minus r signal.
> The output of each trigger is fed into a circuit that gives you 
> control over threshold, attack and release.
> You can solo any of these signals, and will notice that the S trigger 
> contains no audio if you feed it a mono sorce panned to center, 
> because the two channels cancel one another out.
> But, when you pan left or right, you start turning up in the S 
> trigger, with a phase inversion depending on which side you are panned to.
> The basic idea for widening or narrowing a mix, is that if the gains 
> of the two stages, m and s, are equal, the resultant output will be a 
> regulard stereo mix, with middle being middle, hard left being hard 
> left, and hard right being hard right, just like normal.
> But, if you change the relative gains between the m and s sections, 
> then only partial cancellation occurs, or too much cancellation, in 
> which case you start hearing out of phase stuff, which kind of makes 
> it sound like it is behind you.
> So, they use the outputs of these triggers to modulate those gains, 
> and make the mix fluctuate in sync, or sort of in sync, with the 
> dynamics of the program material.
> You can hollow out the middle, and force more stuff to the sides.  Or 
> you can do the opposite.
> It's a cute little tool, and you can probably create some interesting 
> effect with it, if you are into that sort of thing.
> But, you can also just use one section, such as the m section, just as 
> a regulared 2 track stereo, and just modulate the gain of that filter 
> by it self, or in combination with the dry signal, to get partial 
> effects,  like an acoustic guitar that gets a bit brighter when a bass 
> note is hit, just to keep the upper notes from getting buried.  Just 
> set the m trigger frequency down in the bass range, and use it to 
> expand the m filter, with its frequency set up high, and a wet dry mix 
> to fill in down low where the filter doesn't go.
> Yes, this tool can be a nice little single band  compressor or 
> expander if you want it to. But, you've already got a few of those.
> Anyway, for what it's worth, that is what I know about it.
>
>
> _______________________________________________
> RWP mailing list
> RWP at bluegrasspals.com
> http://bluegrasspals.com/mailman/listinfo/rwp

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://bluegrasspals.com/pipermail/rwp/attachments/20160104/1aa18614/attachment.html>