[sdiy] [OT] Analog synths with 2 pole filters

[Tom Wiltshire]

On 22 Feb 2013, at 17:35, cheater cheater <cheater00 at gmail.com> wrote:

> Hi Tom,
> regarding the SSM2164 VCF, why not compensate the feedback as the
> cutoff CV changes?
> 
> On the topic of cutoff-dependent resonance, the WWAYM NWSynth VST
> plugin had something like this (you could set the resonance make-up
> via several sliders, like a graphical EQ, and then you had an overall
> resonance knob). That made its tired old DSP code actually sound
> interesting.
> 
> Cheers,
> D.

It's a possible solution, but it's compensating for the problem, rather than actually solving the problem. In that respect, it's not such a good solution.

Still, if the filter was being driven by a microprocessor which had control over the "resonance" (damping) that's probably exactly the approach I'd take - stick a compensation table in the code. Dirty, but simple and effective.

T.