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Doepfer A-106-1 Xtreme Voltage Controlled Lowpass & Highpass Filter Module

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Shop more: Synth modules| Doepfer

Module A-106-1 is a unique low/high pass filter and has its origin in Doepfer's experiments to build an MS20 filter clone. In contrast to other filter designs, it has different audio inputs for low and high pass, but only one audio output. The type of filter (12dB low pass, 6dB high pass or any mix) is defined by the shares of the audio signal fed to the corresponding inputs. Even two different audio signals can be used as low and high pass input. A special feature is the polarizer at the high pass input that allows to add/subtract the high pass to/from the low pass share, leading to pseudo band pass and notch responses.

Another special feature is the clipping controls, which allow independent adjustment of the positive and negative clipping level. The resonance goes up to self-oscillation, but with a clearly different behaviour than on other filters. At certain resonance and clipping settings the self-oscillation generates rectangle or short sawtooth shaped pulses.

In general, the A-106-1 is a very strange and awesome filter and far away from being perfect (e.g non-linear control scale, self-oscillation with all sorts of waveforms except sine, a lot of roaring, rattling, noise or other unpredictable sounds at high distortion and resonance settings, high distortion or audio level overrides the resonance, significant CV feedthrough). But the A-106-1 has a lot of character - probably much more than any other filter of the A-100 - and is able to generate filter sweeps which are not possible with any other filter.

  • 3 cutoff CV inputs: 1x 1V/octave, 1x with polarizer, 2x with attenuator
  • Low pass input, normalized to high pass input
  • Resonance loop (in and out), audio output
  • 3U Eurorack module, 14HP wide, 40mm deep

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