[sdiy] Sallen Key with input mixing to generate all shapes

[Andrew Simper]

On 22 December 2014 at 10:53, Tim Parkhurst <tim.parkhurst at gmail.com> wrote:
>
> Ken Stone's take on the Steiner-Parker Synthacon filter does this too.
> http://www.cgs.synth.net/modules/cgs35_syntha_vcf.html
>
> Cheers,
>
> Tim (and a notch filter in a pear treeeeeeee) Servo
> ---
> "Sire, the church of God is an anvil that has worn out many hammers." - H.L. Hastings

Tim, this isn't the same thing, this is the regular MS20 type mixing
so you only get a one pole high pass this way, and no notch / peak are
possible from summing and differencing the low and high pass. The
system I've outlined allows for all the same responses and summings
you can do with an SVF.

Andy