Sonic XV

A four pole diode ladder filter after the Musonics Sonic V of the early 1970s, with 24 dB and 6 dB low pass and band pass outputs, and resonance under voltage control, its level corrected on the 24 dB output. Two waveshapers take it past filtering: a six stage diode breakpoint wavefolder on the input, blended wet and dry, its drive set by hand or by voltage, with a three position bias switch; and a second one in the resonance loop that adds distortion, also blended and voltage controlled. With four CV inputs, it adds harmonics as well as taking them away.