Wiardgroup

true - it is a sallen-key filter, but, since it can be switched from
low pass to band pass to high pass, then, by definition, it is a state
variable, too. :-)

gc

"john mahoney" <jmahoney@g...> wrote:
>
> ----- Original Message ----- 
> >
> > The basic sound of the Borg2 and the Boogie is quite separate and
> > unique.  The Boogie is a ladder design - it has a 'Moogish" timbre.
> > The Borg 2 is a 12db/oct state variable.
> 
> Well, not quite. Grant recently wrote:
>     "Personally I find state variable filters to be completely boring.
> Although the SEM used one and some people like it. For musical drama, a
> Sallen-Key (Borg) or Butterworth 4 pole (Boogie) gives much better
results.
> Five years ago I prototyped a state variable filter made with
Vactrols and
> it was so 'plain vanilla' I almost cried. Painfully unexciting."
> --
> john
>