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Questions on building the Korg MS20 Modular Synth Filter module.
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Questions on building the Korg MS20 Modular Synth Filter module.

Questions on building the Korg MS20 Modular Synth Filter module.

So, I ran some simulations through Pspice of the Korg MS20 VCF module and for some reason the resonance control isn’t manipulating the frequency content of the signal before the cutoff. Instead, it attenuates the beginning of the signal the smaller the resonance knob resistance is.

https://preview.redd.it/lw3x0jn522z51.png?width=788&format=png&auto=webp&s=0de9627953713b14958b3e92a09a0c666fedac8f

Here is the output signal with the resonance knob set to 10k ohms:

​

https://preview.redd.it/uw9ld2il22z51.png?width=1868&format=png&auto=webp&s=41e5706d1a23679789e4f4f4ad140f59fc2d2a8b

Here is the output signal with the resonance knob set to 500k ohms:

​

https://preview.redd.it/xhmmmrfm22z51.png?width=1859&format=png&auto=webp&s=83fcfb1b331ae0bb53b09dd324510bc627b739a3

Is there any way to fix this to where the resonance knob manipulates the opposite side of the signal near the cutoff?

(Thanks in advance, I'm extremely new to reddit and I've been looking for an answer to this question for a long time now)

submitted by /u/Kid_TTZ
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