[sdiy] Resonance control taper ?

Danjel van Tijn / intellijel danjel at intellijel.com
Sun Sep 11 04:55:19 CEST 2022

Hey Everyone,

I was curious if there was generally a preferred control curve for
resonance on a synth filter?  i.e. exponential vs. linear

Dave Rossum's site has a brief note about this:

"There is no inherently desirable taper for Q control. In highly resonant,
but oscillation-proof filters such as state variable designs, it makes
sense to exponentially control Q. But in ladder filters, oscillation is
expected, and high Q’s without oscillation are not practically achievable.
The Rossum Electro EVOLUTION implements approximately linear control of the

It would be interesting to see a list of famous filters/synths and what
control curve they implemented. For example, the SH-101 and Oberheim SEM
both use linear tapers.


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