The A-124 Module is a 12dB multimode filter based on the unique filter circuit from the EDP – Wasp Synthersizer (built in the end of the seventies, manufactured by the UK company “Electronic Dream Plant”)
The filter is equipped with a band pass out put 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
For more detailed information please look at the English user’s manual A124_man.pdf
The function and operation of this module is very similar to the module SEM VCF A-106-5. But the sound of both filters is very different ! The only functional difference is the position of the sockets and controls, and the function of the controls CV2 (A-124: normal attenuator, A-106-5: polarizer).