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Ms20-VCF clone based on BartonSynth version.
cutoff + resonance, with a switch to chose low pass or high pass mode.
CV control on the filter cutoff.
Self oscilation if resonance pushed to maximum, can be adjusted with 2 trimmers :
- 1 trimmer for the sine wave amplitude (resVol)
- 1 trimmer for the level at which the knob for resonance starts the self oscillation (resLvl)
Uses an SMD LM13700 because the DIP ones are not produced anymore.
Regular build, I use ceramic capacitors but you can use film/polyester.