MOTM MULTILADDER FILTER

This is a superb sounding voltage controlled filter module that is based upon the work of Bob Moog in the 1960s. It uses the classic ladder design implemented with transistors and passive feedback control. However, I have made all four rungs of the ladder available as outputs. At first glance this seems to offer just a choice of 1, 2, 3 or 4 pole outputs. The 4 pole output producing a smoother sound due to the greater steepness of filter slope. But, it is also possible to mix these outputs together to create new and interesting responses including varying degrees of band pass filtering. The Oakley MultiMix module provides an easy way of doing this, since you can subtract and add signals together.