All the filters you want

[Grant Richter]

Take any 24DB (4 pole) low pass filter.
Take the outputs from the individual integrator buffers.
Sum the outputs together with different coefficients
(+ and -). That will give you all the possible
filter responses for four poles.

If you would like to make a so called "hexagonal"
filter, then do the same thing with six sections.

You can start with the resistor values from the
Matrix 12 and make a 16 mode or use pots instead
and make a multi-mode.

Add positive feedback from the output back to the
input to add resonance.

----------
>From: Rob Rickner <rrickner at zoo.uvm.edu>
>To: synth-diy new <synth-diy at node12b53.a2000.nl>
>Subject: Orgon Systems Mulitmode Filter
>Date: Sun, Apr 30, 2000, 1:24 AM
>

> I wanted to know more about the 20 mode filter they make so I asked:
>
> The ENIGISER filter has 20 different filter responses, 7 low pass
> responses
> (1 pole, 2 pole, 3 pole and 4 pole), 1 x all pass peak, 2 x all pass
> reject,
> 2 x high pass, 1 x high pass + band pass and 7 x band pass. I can say
> without shadow of doubt that you will not have heard any of these filter
>
> responses before, the sound is 100% unique to orgon systems and also
> 100%
> analogue!.
> The filter also has voltage controlled resonance and two resonance
> modes,
> clipped and unclipped resonance + 2 audio inputs with level controls and
> 2
> CV inputs with level controls.
>
> Thought you might be interested.
> Rob Rickner
>