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A multimode filter is based on a very special filter circuit used in the EPD Wasp, an English synthesizer of the late 1970ies. The sound is full of character, dirty, with an unstable resonance and a trend to distort. Who is in search of a very aggressive, sick filter definitely should take the A-124 into consideration.
The filter abuses digital inverters as operation amplifiers what is very formative to the sound. The filter is equipped with a band pass output and a combined low/notch/high pass output. A control knob defines the relation between low and high pass signal for this output. In the middle position of the mix knob one obtains a notch filter. The volume of the audio signal can be controlled with a knob and even distorted. Of course the filter features resonance but this one can´t self-oscillate (see misc..).
WIth a long trajectory building synths, MIDI keyboards and designing bespoke devices for music pioneers Kraftwerk, Dieter Doepfer decided to design his own modular synthesizer in 1995 based on existing electrical and mechanical specifications of lab equipment he used during his years at university. The official presentation of the system at 1996 Frankfurt Musikmesse caught everyone by surprise and created lots of interest. After Doepfer published the specifications on his website, many instrument designers and engineers saw the potential of the new Eurorack format. Doepfer continues expanding their catalog of over 200 modules (and counting), operating from their modest offices in the outskirts of Munich.
