Module A-121s is a dual multimode filter which can be used for stereo applications as well as for parallel or serial organized dual mono filters. The core is a 12dB multimode filter identical to the modules A-121-2andA-121-3. The selection of the filter type is continuously from lowpass via notch and highpass to bandpass. We attached great importance to the usability of the manual controls and CV inputs for both stereo and dual mono applications. For the filter parameters frequency (F), resonance (Q) and type (T) common controls and CV inputs as well as single controls and CV inputs are available. For the filter frequency in addition a manual control and CV input for the filter spread (frequency difference or delta F) is available.
Power: 100mA @ +12 / 100mA @ -12V
Stereo filter: two different audio signals are connected to the audio inputs. At the outputs appear the filtered signals. The filterings depend upon the positions of the manual controls and the applied control voltages.
Serial mono filter: the mono signal is applied to audio input 1. Audio output 1 is connected to audio input 2. The filtered mono signal appears at audio output 2. One has to pay attention that the filter parameters are set in a way so that a signal will appear at the output. If for example a lowpass and a highpass are daisy chained the frequency of the lowpass has to be higher than the frequency of the highpass. Otherwise no signal will appear at the output.
Parallel mono filter: the audio signal is fed to both audio inputs (e.g. via the normalled sockets In1>In2). By means of a mixer module the audio outputs 1 and 2 are mixed.
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