SV: Re: SV: Re: [sdiy] Nonlinearities in IR3109 filters

[Antti Huovilainen]

On Thu, 3 Aug 2006, elmacaco wrote:

> a positive use for having the reduction with high resonance included (as it
> was on the andromeda) and there is no real benefit

Unless you want that "Moog sound" :) For musicality I prefer 6dB reduction 
with increasing resonance (used in late CEM filters). It's rather trivial 
to get anything from 0dB to 12dB passband reduction with resonance by just 
varying the amount of input signal mixed to resonance path.

> besides, we all know it's the moog oscillators that really give the filter
> such a good name

Actually it's the VCA. And no, I'm not even kidding. In Taurus mk1 getting 
the filter and VCA drive levels right is the key to the sound. I assume 
this holds for Minimoog too as the VCA / output circuit has 3 differential 
pairs in series.

Antti

"No boom today. Boom tomorrow. There's always a boom tomorrow"
   -- Lt. Cmdr. Ivanova