The MRG LPF variant A is a 18dB + 6db low pass voltage controlled filter based on the AS3320 (clone of the CEM3320).

The main characteristic of the filter is that one of the four poles is pushed farther away from the origin in the complex plane, creating a slope of 18dB at cutoff with no resonance, and a gentler response towards peak when the resonance is added.

This dramatically changes the tone of the filter, and it creates an unique, acid but bass rich filter that still maintains that sound clarity that the AS3320 provides with exceptional reliability.

In order to shake things a little bit more, a gain control is added, that reaches saturation pretty soon, but can also be lowered to further increase the range of this filter.

Price : 

Built and tested £60 or DIY KIT £39

More info here : https://mrgsynth.tlbflush.org