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In 2016 we built the [Polivoks VCF by ericasynths](http://www.ericasynths.lv/en/shop/b-stock/diy-polivoks-vcf-clone/). This is a [VCF (Voltage Controlled Filter)](VCF) powered by old soviet era programmable opamps. Most resources can be found on ericasynths site, the module is also on [modulargrid](https://www.modulargrid.net/e/erica-synths-polivoks-vcf-).
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