[sdiy] Article "Analyzing the Moog Filter"

[Ian Fritz]

Well. There’s the MS20, my Threeler, the Mutant Vactrol Filter ...

> On Aug 22, 2019, at 2:51 PM, Donald Tillman <don at till.com> wrote:
> 
> I think he's got a point.  How many filter topologies are there that are analog, audio range, and accurately voltage controlled over a substantial range?   I count two.
> 
> The Diode Ladder is essentially derivative of the Moog, even though it works differently.  
> 
> There are VCFs based on the Sallen-Key, or any other active filter topology, hacked up for voltage control, sure.  Though they have less precise tuning.
> 
> In practice, don't the Moog Ladder and the State Variable account for 95% or more of the filters used in synths?  What am I missing?
> 
> I have several filter topologies of my own, of course, so I'm not saying there are inherent limitations or anything.
> 
>   -- Don
> --
> Donald Tillman, Palo Alto, California
> http://www.till.com
> 
> 
>> On Aug 22, 2019, at 12:52 PM, Kylee Kennedy <kmkennedy at gmail.com> wrote:
>> 
>> Honestly it was hard to get past "Learn about one of the only audio filter topologies out there, the Moog filter!"
>> 
>> Kylee
>> 
>> 
>>> On Thu, Aug 22, 2019 at 12:33 PM Ian Fritz <ijfritz at comcast.net> wrote:
>>> Not many synth filters? That could make many people unhappy. Oh well 
>>> it's just a kid.
>>> 
>>> Ian
>>> 
>>> On 8/22/2019 12:51 PM, Ingo Debus wrote:
>>> > Anyone seen this?
>>> > https://www.allaboutcircuits.com/technical-articles/analyzing-the-moog-filter/
>>> > https://www.allaboutcircuits.com/technical-articles/small-signal-open-loop-transfer-function-moog-filter/
>>> > 
>>> > Ingo
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