Questions on building the Korg MS20 Modular Synth Filter module.

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Questions on building the Korg MS20 Modular Synth Filter module.

<table> <tr><td> <a href="https://www.reddit.com/r/synthesizers/comments/jtlzvo/questions_on_building_the_korg_ms20_modular_synth/"> <img src="https://b.thumbs.redditmedia.com/latrgNNxQ067Qme78r7HiWTbOmTuiQvNI653C-KIaJc.jpg" alt="Questions on building the Korg MS20 Modular Synth Filter module." title="Questions on building the Korg MS20 Modular Synth Filter module." /> </a> </td><td> <!-- SC_OFF --><div class="md"><p>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.</p> <p><a href="https://preview.redd.it/lw3x0jn522z51.png?width=788&amp;format=png&amp;auto=webp&amp;s=0de9627953713b14958b3e92a09a0c666fedac8f">https://preview.redd.it/lw3x0jn522z51.png?width=788&amp;format=png&amp;auto=webp&amp;s=0de9627953713b14958b3e92a09a0c666fedac8f</a></p> <p>Here is the output signal with the resonance knob set to 10k ohms: </p> <p>&#x200B;</p> <p><a href="https://preview.redd.it/uw9ld2il22z51.png?width=1868&amp;format=png&amp;auto=webp&amp;s=41e5706d1a23679789e4f4f4ad140f59fc2d2a8b">https://preview.redd.it/uw9ld2il22z51.png?width=1868&amp;format=png&amp;auto=webp&amp;s=41e5706d1a23679789e4f4f4ad140f59fc2d2a8b</a></p> <p>Here is the output signal with the resonance knob set to 500k ohms: </p> <p>&#x200B;</p> <p><a href="https://preview.redd.it/xhmmmrfm22z51.png?width=1859&amp;format=png&amp;auto=webp&amp;s=83fcfb1b331ae0bb53b09dd324510bc627b739a3">https://preview.redd.it/xhmmmrfm22z51.png?width=1859&amp;format=png&amp;auto=webp&amp;s=83fcfb1b331ae0bb53b09dd324510bc627b739a3</a></p> <p>Is there any way to fix this to where the resonance knob manipulates the opposite side of the signal near the cutoff?</p> <p>(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)</p> </div><!-- SC_ON --> submitted by <a href="https://www.reddit.com/user/Kid_TTZ"> /u/Kid_TTZ </a> <br/> <span><a href="https://www.reddit.com/r/synthesizers/comments/jtlzvo/questions_on_building_the_korg_ms20_modular_synth/">[link]</a></span> <span><a href="https://www.reddit.com/r/synthesizers/comments/jtlzvo/questions_on_building_the_korg_ms20_modular_synth/">[comments]</a></span> </td></tr></table>