The Stereo version of the classic SeM20 filter module

The SeM20st is a stereo version of the first module bubblesound put out, the SeM20. It has become one of the classic filters in the Eurorack world. The SeM20st is the most versitle analog stereo filter on the market today. The inputs on the Left side are all normalized to the Rght, so one input can be turned into a stereo signal. There is an Offset for the Left Cutoff, this allows a wider stereo field especially if the input is coming from a mono source. The CV inputs on the Left can also control the Cutoff and Resonance of the Right side. The Right side CV Cutoff pot is an attenuvertor, when it's at noon it's of, turn clockwise from noon the pot acts like a normal attenuator, gradually adding the CV to the Cutoff. When it's turned counter-clockwise from noon the CV is inverted. This can be used with a single LFO into the Left Cutoff CV to create a sort of ping-pong with the 2 sides, as the Cutoff goes up on one side it goes down on the other. The Resonance CV will work with either an LFO or an Envelope. Each side has 4 outputs available. The Notch Ballance pot sweeps from Low Pass to High Pass and can produce some really nice phasing .