AI004 OTA Voltage Controlled Filter
https://aisynthesis.com/product/diy-ms-20-filter/
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From the AI Synthesis website:"This OTA Voltage Controlled Filter uses the same filter structure as the venerable Korg MS 20 Filter. The filter is switchable between Lowpass and Hi Pass modes, and features an updated diode gain stage in the resonance section. "A couple of personal notes on this:This is a great starter VCF. If you're looking for precision or flawless performance, you're in the wrong price range. There's a big section at the bottom of the product page for this module that explains some of the design quirks. I would definitely recommend reading through those to better understand some of the limitations of the filter: Manually sweeping the filter too fast can occasionally cause the audio to flake out. If you sweep through the frequency range again, it will re-engage. CV1 has an attenuverter, which is a great feature over the standard attenuation knob. Great condition. Minor rack rash. Tested and in working order. Was originally built from a kit. From a smoke-free home studio.
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