[sdiy] SSM2040 filter question

[Antti Huovilainen]

On Wed, 12 Nov 2003, Paul Maddox wrote:

> Having played a Minimoog and Memory moog, the KEY thing about the moog
> filter isnt the structure, its when you overdrive it, up to that point the
> sound is pretty much the same as a standard 4 pole Low pass filter, but

Yes. As long as the amplitude is low, Moog, SSM2040 and OTA filters are
the same.

> overdrive it, and things get REALLY funky. That is where the hard part
> comes, The Virus C (new moog filter) sounds  close, but you'd have to have

I emulate the non-linearities.
In which ballpark is the input amplitude for clean and distorted usage?

> As for interesting filters, for me, it has to be the Oberheim Xpander, ok, i
> know, boring 4 pole lowpass, but the way they get those 16 different
> 'slopes' is superb, I'd love to hear/see a good version of that for a DSP..

Send me an URL to the schematic and I'll see if I can do it.

Antti

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