The original Octave Cat filter is nothing but a standard 24dB filter based
on four OTAs (CA3080). I cannot see why it shoud sound so extraordinary. We
"designed" such a filter module already in the nineties when be began the
A-100 (i.e. before this forum was born). But we never published this filter
as the other "early" A-100 filters (A-120, A-121, A-122) sounded much better
from our point of view. But in the meantime there is a demand for even
special, strange or "bad" sounding filters (like the A-124 Wasp filter or
the A-106-1 Extreme filter) as the user's taste has changed. E.g. we payed
attention in the beginning to avoid distortion for audio processing modules
(e.g. VCF, VCA, phaser) but in the meantime each audio processing module has
to include the distortion feature to be approved by the customers (some
A-100 users may wonder why A-120, A-121 or A-122 do not distort with
standard A-100 levels, it's simply "history").
I will have to look to our prototype box. May be I can find the prototype of
this never published module and resuscitate it (we also had a never
published 12dB filter with two CA30380). I thought we have enough filters.
But who knows .....

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto: Doepfer_a100@yahoogroups.com ]Im Auftrag von pH
> Gesendet: Samstag, 11. Juni 2005 23:56
> An: Doepfer_a100@yahoogroups.com
> Betreff: Re: 1 Re: Octave Cat Filter
>
>
> On 6/11/05 12:25 PM, "eyesleeandrews" < grand.poohbah@... > wrote:
>
> > I vote YES.....!!! But then again, I started the thread, so
> that's goes with
> > out saying.
> >
> > I've been doing a bit of research. I definitely think the
> original filter
> > would be the best. It
> > is certainly the most unique sound.
>
> It shouldn't be called a CAT filter then. The SSM2040 is one of
> my favorite
> filters, but it is used in many things. Probably best known for
> the Prophet
> 5 or Octave Voyetra 8. The never released E-mu Audity used it and later
> E-mu modulars, and the Symetrix Phase filter:
> http://www.modezero.com/phase-filter.htm
>
>
> MOTM has done a wonderful clone of the lowpass part, and my impression is
> that this was a hell of a lot of work and research to get even that part
> right. http://www.synthtech.com/motm440.html
>
> A full clone of the 2040 would be great, but I don't see it happening from
> Doepfer anyway. The amount of R&D to get it right would be too much. This
> chip has so many possiblities/modes.
>
> best,
> phil
>
>
>
>
>
>
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>