Hi Dieter

> 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.

I have/had the Formant VCFs, which are based ont the standard CA3080
schematic.
- The 12dB Version is really something on its own and I like it very
much (isn't it the same as in the Oberheim SEM module ).
- I never liked the 24 dB version of the Formant Filter. Assumingly this
dedicated implementation was not good. But there are a lot of synths
which sound really great(!) with this filter type: at least different
Roland Synths like the SH-2, Jupiter 8, Roland System 700 (maybe some
are with BA662 + FET-buffer instead of the CA3080 + OpAmp-buffer).

So I think it is worth a test.

> published 12dB filter with two CA30380). I thought we have enough filters.
> But who knows .....

I think, if you find a catchy name like "Jupiter-Filter" or "SEM-Filter"
its reason enough for many customers to buy it ;-)))

Florian