[sdiy] 2164 Korgasmatron VCF

[mark verbos]

On Aug 15, 2010, at 2:22 AM, David G. Dixon wrote:

> 
> 
> Concerning the notch setting: It is just the sum of the LP and HP responses,
> and that's what it sounds like as well.  It's a good sound.  You can
> modulate it with an envelope like a LP filter, but the buzzy HP response
> stays superimposed on top.  It's a beefier, raunchier sound than LP alone.
> It also sounds really good with high resonance.
> 

I know that someone mentioned this before, but it didn't get much attention. Why is the middle position on other sallen & key multi mode filters a bandpass. I know this is the case for the Wiard Borg (Grant is probably reading this and can comment). Is it because the input to the cap for the hipass mode is inverted with respect to the lopass input?

Mark