Epoch Modular Twin Peak MK2 (Pre-Owned)

Variable Curve Filter TwinPeak is a 4-pole voltage controlled filter designed by Rob Hordijk. The filter includes a “wave folding” circuit that allows change to its response-curve—from low pass to variable width band pass and in between. This response morphing capability is based on the “inverse-parallel” principle for low pass filters, where two filters with identical gain can be combined to create a band pass curve but with two separate peaks at the corners of the pass band. It is this same principle that forms the basis of the Twin Peak Resonator in Hordijk’s Blippoo Box as well as his own 5U-18db module. This set up offers distinct advantages over a low pass/high pass-series configuration. E.G., in band pass mode, with the curve knob fully clockwise, the cutoff frequencies of the filters can be crossed and, regardless of which is tuned higher or lower, the filter output will be a band pass response. In either case, all frequencies below the cutoff of the lower tuned filter are supp