As you can see by the included screenshots ,I was able to recreate /mimic the sallen key like resonance spikes in reaktor .
The filter I took as a starting point was a reaktor core moog ladder filter , with a built in saturation curve …inside he filter’s feedback loop, it’s necessary that the saturation curve is inside thefilter’s feedback loop ,post saturation won’t do the trick
INcreasing the input gain ( saw wave ) reduces/attenuates the resonance spikes ,making the saw wave more squarelike( because of the saturation curve ).
It was then just a a matter of increasing the resonance into self oscilation ,the resonant spikes appeared at the middle,zero crossing of the saw wave , typical of an overdriven filter ( increased input gain ) with self resonance
To be honoust I don’t know how the sallen key topology works , but the results I got from this workaround sounds almost exactly the same as other TRUe sallen key filters.
Currently in redux ( k typefilter ) the resonance self oscilation is limited and I think the saturation is not inside the filter’s feedback loop , but just post filter …
We can increase the input gain with 12 db ( sample properties ) to overdrive the filter ,but when setting resonance at max , this doesn’t give us the desired results n
The redux K filter sounds exactly the same as any other filter with a saturation stage inserted after the filter .
i suppose this is about “sine” self-resonance like ms10 or ms20 filter does
but k35 filter works little different (not better or worst, i have original analog korg filter but ive never used self resonance oscilation) and Redux / R 3.1 filter doesnt have inside but after filter drive so it doesnt do the trick.
gentleclockdivider, you could then connect a sine volume to the resonance value MS20 is completely overrated, IMO… It’s fun to play with, but more a toy than a real synth… No velocity haha. Maybe the oscillators are quite nice. But common, every today’s rompler / virtual analog korg synth like Radias, Microkorg XL, M3, Kronos etc. have much better sounding filters and also oscillators. Why not taking these as a model for a Renoise synth… Would be much more interesting (at least for me ). Analog voodoo? Sorry. My 2 cents.
But very cool you were able to rebuild these filters. Can you do this with radias filters? Can I send you example files, so you are able to rebuild them as an theoretical study in Reaktor?
Why not adding another screenshot with the Redux filter?
So you mean by simply enabling more possible resonance value in the redux filter, this beloved self oscillation would be possible?
gentle: hey sorry, was a bad joke with the sine. Yeah if you think the renoise filters can be improved, then I vote +1 it, of course… Yes I played an original MS20 once, it sounds nice, but I for me, I prefer virtual analog / digital simulations.
Yeah, pre- and post-filter is an essential feature. Also that 2-parallel/serial-crossfading-filtertype is absolutely nice stuff! I wish Renoise… ;)Ok, maybe I am starting to annoying some people here by repeating this radias stuff over and over again
Extra Unison section by Voice multiplication (2-6 voices, detune, spread)
The VPM section really can sound like DX7.
Filter:
two filters, comb filter, LP12-LP24, BP, etc., smooth type crossfading, parallel or serial
And this drive/waveshape section, which sounds simply awesome:
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Pre- / Post-Filter
Types: Decimator, Hard Clip, Oct Saw, Multi Tri (FM like), Multi Sin(FM like), Sub SAW/Squ/Tri/Sin, Pickup
Punch, for extra snappy attacks
Envelopes:
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Curve type for every section, just like Linplug/Rob Papen stuff
Awesome intelligent portamento section:
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These curve types for the pitching in portamento is absolutely cool. The portamento also easily works in polyphonic mode.
Vocoder with formant memory, Audio-In
Awesome FX section, Post 3-band-EQ for every timbre
Most features are still missing in any today’s VST. I don’t know why. For example the portamento curves, which simply sound nice. Or this kind of drive section. So simple, so effective. Pre- and post sound completely different. And I also don’t understand why Korg isn’t make this as an VST, since they do not produce the real Radias (only Microkorg XL/XL+ with a simplified Radias synthesis) anymore… I would say it’s still their best synth out there (besides kronos monster). Maybe the image of that synth goes wrongfully too much in the trance direction.
Radias is a lot cheaper than Korg MS20… I really don’t know why someone should still prefer a MS20.
MS20 is completely overrated, IMO… It’s fun to play with, but more a toy than a real synth… No velocity haha. Maybe the oscillators are quite nice. But common, every today’s rompler / virtual analog korg synth like Radias, Microkorg XL, M3, Kronos etc. have much better sounding filters and also oscillators. Why not taking these as a model for a Renoise synth… Would be much more interesting (at least for me 
). Analog voodoo? Sorry. My 2 cents.
)
