doepfer-a-124

Doepfer A-124 Wasp Filter

Gritty Wasp-inspired multimode filter with distinctive analog dirt

8 HP Eurorack module

The A-124 is a distinctive 12dB/octave multimode filter recreating the unique circuitry of the late-70s EDP Wasp synthesizer. Its peculiar design 'abuses' digital inverters as analog op-amps, creating characteristic distortions and 'dirty' effects that give this filter its signature gritty sound.

Features

  • 12dB/octave slope
  • Wasp synthesizer circuit recreation
  • Cannot self-oscillate
  • Dual CV inputs with attenuator
  • Built-in distortion and dirty effects
  • Simultaneous BP and LP/HP outputs

Controls & Jacks (11)

  • Frequency— Filter cutoff frequency
  • CV 2 Amount— Attenuverter for CV 2 input amount and polarity
  • Res— Resonance/emphasis control
  • Mix— Controls relative amounts of low-pass and high-pass signals
  • Level— Input signal level
  • Freq CV— CV input for cutoff frequency modulation
  • LP/HP Out— Low-pass/high-pass mix output, blended by Mix knob
  • CV 1— Secondary CV input for frequency modulation
  • Audio In— Main audio input to be filtered
  • BP Out— Band-pass filter output
  • Audio Out— Main audio output

How-To Guides

  • Classic Acid Sweep
  • Phasing Notch Effect
  • Dual Filter Textures
  • Percussive Bandpass Hits
  • Bass Grit Enhancement
  • Random Spectral Shifts
  • Envelope Follower Response
  • Sequencer Rhythmic Filtering

Explore the interactive A-124 Wasp Filter panel on BleepDex — tap any control to learn what it does.

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