The Black High Pass VCF from Erica Synths' high-quality Black series is an analog high-pass filter with downstream distortion. The puristic filter has a slope of 24dB and is therefore particularly powerful. The gritty analog sound is somewhere between Moog, Polivoks and a little MS-20 character. The downstream distortion is the icing on the cake of this module, adjustable to your own taste via a trimpot on the back. Two control voltage inputs for cutoff and one for resonance provide exciting filter sweeps.