multimode analog resonant filter based on the MS20 "the MoleS20r ( Pronounced MOLESTER ) is a multimode voltage controlled resonant analog filter, the core of which is a clone of the OTA filter section of the KORG MS-20. i have made a couple slight changes to the original design to get more range of use out of it which i'll explain below, but the calibration that it ships with is nearly an exact reproduction. there have been some additions around the filter. first is a nice clean preamp with more then enough gain to allow you to plug a guitar level signal directly into it and to overdrive the input of the filter. the filter itself was modified to allow you to switch between highpass, bandpass and lowpass with the turn of a knob. the overall cutoff scale and max resonance peak ( far into self oscillation if you want ) are both adjustable via small screwdriver accessible holes in each side. after the filter section is a heavy overdrive distortion that at lower setting will act as a fairly clean makeup gain. there are both a control voltage input and an expressional pedal input and they work in parallel with the cutoff knob so they can all be used at once. the true bypass switch is setup with a toggle for use as a desktop device but i can replace it with a stomp switch if you want, no charge just give me a day or so to get to it. the power supply was intentionally overbuilt and the very small footprint AC wall supply is included"
more info including samples
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