State Variable Filter

A state variable filter can be morphed from low pass to notch to high pass by turning a knob. For example, the Oberheim SEM has one. When the knob is in between, this works like an all-pass, with one gain below the cutoff and another gain above. We can do it now with matching LP12 and HP12 in parallel, combined with X-Fader. Apparently, those two have outputs of opposite sign, as required to make this work. But, the parameters and modulation of the two filters need to be matched, which would be easier if they were in a single package. Modulating the mix knob can produce some interesting effects. This could be a useful addition †o the Drambo arsenal.

Comments

  • I'm sure giku knows the filter, there is one in Zeeon... :)

    Likely to come at some point.

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