Doepfer A-124 Wasp Filter SE black/yellow
Module A-124 is a special 12dB multimode filter using the “strange” filter circuit of the “EDP Wasp” (an analog synthesizer with black/yellow case built end of the seventies, manufactured by the UK company “Electronic Dream Plant”)
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This design “abuses” digital inverters as analog operational amplifiers leading to distortions and other “dirty” effects that generate the specific sound of this filter.
/>The filter is equipped with a band pass output and a combined low/notch/high pass output. For this output a control knob defines the relation between low and high pass signal. If both signals appear at the same level (i.e. middle position of the Mix knob) one obtains a notch filter. Otherwise the low or high pass signal predominates.
The module does not feature self oscillation in contrast to most of the other filters of the A-100 system.
Inputs: Audio In, CV In (2x)
Outputs: Bandpass Out, Low/Highpass Mix-Out
Controls: Audio and CV attenuator, Frequency, Resonance, LP/HP Mix
BP Audio output
LP/HP Audio output