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The VCF-SED module is a voltage controllable low pass filter as a single ended discrete design, using transistors that can be driven into clippng zone for a great sound.
The filter module has two audio inputs with input 1 offering variable attenuation. When not patched the filter output is fed back into this input. By this, it is easy to recreate the legendary feedback-trick that leads to additional pushing bass. Input 2 has a fixed input sensitivity that matches the Mix output of MFB's oscillator module OSC-03.
Filter cutoff can be controlled manually as well as from CV-sources. CV-1 is adjustable in intensity and intended to be used with an envelope generator. CV 2 has two functions: It accesses the internal Key CV-voltage provided by the system-bus (when fed by a MIDI/CV-interface). This allows for easy key-tracking for the cutoff-frequency. Tracking-intensity can be adjusted by a trim-potentiometer. An additional front-panel-input allows adding a further CV source (e.g. LFO) that uses the same potentiometer. To use this input independently, the system-bus-access can be disabled by setting a jumper on the circuit board.
Filter resonance, called emphasis, can also be adjusted manually and by an adjustable CV input.
Manfred Fricke has been creating video and audio devices since the 1970s from his workshop in Berlin. His no-frills and affordable synthesizers and drum machines are quite popular and have a number of dedicated adepts.