Doepfer
Lineup 32 ingested · audit-only catalog
Lineup transcribed from https://doepfer.de/a100e.htm ↗, last checked 2026-05-13.
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A-101-2 Vactrol Low Pass Gate
Vactrol-based Low Pass Gate inspired by the Buchla 292. Combines a 12 dB low pass filter and VCA, switchable between LP, VCA, and LP+VCA modes. Features resonance up to self-oscillation, CV and audio attenuators, and two gate inputs for mode control.
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A-102 Diode Low Pass Filter
Reproduction of a legendary voltage-controlled diode ladder lowpass filter. Uses diodes (instead of transistors) as frequency-controlling elements in the filter cascade, resulting in distinctive resonance and frequency behaviour where the two parameters are not fully independent. 24dB/oct slope, self-oscillation capable.
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A-103 18dB Low Pass Filter (TB-303)
Voltage controlled 18dB/octave lowpass filter based on a modified transistor ladder (Moog ladder), reproducing the legendary TB-303 filter circuit. Features three CV inputs, manual cutoff frequency and resonance controls up to self-oscillation.
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A-104 Trautonium Formant Filter
Fourfold formant filter inspired by the Mixtur-Trautonium by Oskar Sala, consisting of four parallel resonance filters with common input and output. Each filter can be switched to low pass, band pass, or off, with separate manual controls for frequency, resonance, and level. No voltage control. Frequency range per filter approximately 50 Hz to 5 kHz.
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A-105-2 24dB SSI Low Pass Filter
Voltage controlled 24dB/octave lowpass filter based on the SSI2144 chip (successor to the SSM2044), with two audio inputs and CV control over frequency and resonance.
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A-106-5 12dB SEM Filter
12dB multimode filter based on the Oberheim SEM circuit. Features a bandpass output and a combined low/notch/high pass mix output. Does not self-oscillate.
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A-108 6/12/24/48dB Low Pass Filter
Voltage-controlled transistor-ladder (Moog ladder) lowpass filter with 8 internal filter stages (6–48 dB/oct). Four simultaneous lowpass outputs at 6, 12, 24, and 48 dB/oct (factory default), plus a band pass output. Three CV inputs for frequency control; external feedback input for voltage-controlled resonance.
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A-110-1 Standard VCO
Voltage-controlled oscillator producing four waveforms simultaneously (square, sawtooth, triangle, sine) with a frequency range of about ten octaves, controlled by Range switch, Tune knob, and CV inputs.
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A-111-6 Miniature Synthesizer Voice
Complete monophonic synthesizer voice in 10HP featuring a triangle-core VCO with sub-octave, a balance/mixer unit, 24dB lowpass VCF (self-oscillating), VCA, and an AD/ADSR/AR envelope generator.
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A-118 Noise/Random
A noise and random voltage generator producing white noise, colored noise, and random voltage.
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A-120 24dB Low Pass 1
Voltage controlled 24dB/octave transistor ladder lowpass filter with three CV inputs, manual cutoff frequency control, and resonance adjustable to self-oscillation.
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A-121-2 12dB Multimode Filter II
Voltage-controlled multi-mode filter with -12 dB/octave cut-off slope, four simultaneous outputs (LP, HP, BP, Notch), CV-controllable frequency and resonance, and self-oscillation capability.
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A-121-3 12dB Multimode Filter (Slim Line)
Slim line 4HP voltage-controlled multimode filter with -12 dB/octave slope, four simultaneous outputs (LP, HP, BP, Notch), voltage-controlled resonance, and self-oscillation capability.
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A-121d Dual Multimode Filter
Dual multimode filter with two independent VCF channels; one provides highpass and bandpass outputs, the other provides lowpass and bandpass outputs. Includes a common frequency control, a frequency spread (Delta) control, individual resonance and CV attenuators, and a simple mixer unit. Can be used as parallel or serial dual filter, stereo filter, or cascaded with additional modules.
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A-121s Stereo Multimode Filter
Dual multimode filter usable for stereo applications or as parallel/serial dual mono filters. Filter type continuously morphs from lowpass via notch and highpass to bandpass (-12dB/oct). Offers common and individual controls for frequency, resonance, and filter type, plus a frequency spread (Delta F) control.
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A-124 Wasp Filter
Special voltage-controlled multimode filter with a cut-off slope of -12dB/octave, using the peculiar electronic circuitry of the EDP Wasp synthesizer. Abuses digital inverters as analog operational amplifiers. Has band-pass output and combined low/notch/high-pass output. Cannot self-oscillate.
- A-126-2 Voltage Controlled Frequency Shifter II
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A-127 Triple Resonance Filter
Triple voltage-controlled resonant bandpass filter with three independent BP filter channels sharing a common audio input, each with internal triangle-wave LFO for frequency modulation, per-channel CV input, and individual audio outputs plus a summed mix output.
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A-128 Fixed Filter Bank
15-band fixed filter bank made up of 15 parallel band pass filters with fixed middle frequencies and bandwidth; each band has its own amplitude control knob for attenuation.
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A-130-2 Dual VCA (Linear/Exponential)
A slim dual VCA offering two identical voltage-controlled amplifier channels, each with manual initial gain, a CV attenuator, and a switchable linear/exponential response curve. DC-coupled throughout, making it suitable for both audio and control voltage processing.
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A-130-8 Octal Linear VCA
Eight independent linear voltage-controlled amplifiers (VCAs) with three summing mix outputs (1–4, 5–8, 1–8). Fully DC-coupled; suitable for both audio and CV processing.
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A-137-1 Wave Multiplier 1
Voltage controlled waveform multiplier with 4 wave-folding stages, a VCA for Multiples control, and independent manual and CV control over Multiples, Folding Level, Symmetry, and Harmonics parameters. Acts as an inverse low-pass filter, adding harmonics to signals with few harmonics (e.g. triangle or sine). Fully DC coupled.
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A-137-2 Wave Multiplier II
Wave Multiplier II: generates four phase-shifted copies of an audio input signal (sawtooth, triangle, or sine) and adds them to the original to produce a fat sound similar to five independent VCOs. Phase shifting is achieved by comparing the input with a slowly varying CV; the resulting rectangle is algebraically added to produce shifted waveforms.
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A-138s Mini Stereo Mixer
A simple but effective 4-in-2 stereo mixer with four inputs, each with a Level attenuator and Pan control, routing signals to Left and Right outputs. DC coupled for use with both audio and control signals.
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A-150-1 Dual Voltage Controlled Switch
Dual voltage-controlled switch containing two independent bidirectional switches. Each switch routes a common Out/Input to one of two In/Outputs based on the control voltage level. Two LEDs indicate which output is active.
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A-151 Quad Sequential Switch
Electronic four-position rotary sequential switch with trigger and reset inputs, four bidirectional I/O jacks, a common Out/Input, four LEDs indicating the active step, and a toggle switch to limit steps to 2, 3, or 4.
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A-183-2 Offset-Generator / Attenuator / Polarizer
Voltage offset generator combined with an attenuator/polarizer. A toggle switch selects between attenuator and polarizer (attenuverter) modes. The DC offset is adjustable via the Offset knob, and the input signal can be attenuated or bipolar-scaled and added to the offset voltage.
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A-188-1 BBD (8192-stage bucket-brigade delay)
A Bucket Brigade Device (BBD) analog delay module. Audio is passed through a chain of sample-and-hold stages clocked by an internal high-speed VCO or external clock. Typical applications include flanger, chorus, analog delay, and Karplus-Strong synthesis. The module features voltage-controlled clock rate, dual CV inputs with polarity switches, feedback with polarity switch, external feedback insert, and separate BBD and mixed outputs.
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A-188-2 BBD (1024/4096-stage bucket-brigade delay)
Tapped BBD delay module using the MN3011 chip, providing six tapped outputs at BBD stages 396, 662, 1194, 1726, 2790, and 3328. Features two independent mixing sub-units, each with per-tap level/polarity controls and a wet/dry mix control, a voltage-controlled feedback section with polarizer, a built-in high-speed VCO clock, and CV control over delay time.
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A-188-9 High Speed VCO / PLL
Precision audio VCO with an integrated PLL (phase-locked loop) that multiplies the VCO frequency by 32, primarily for driving BBD delay modules. Outputs sawtooth, triangle, and rectangle waveforms; operates in Audio VCO or High-Speed VCO mode.
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A-129/1 Vocoder Analyzer
Vocoder analyzer section. Splits a speech/voice signal through a bank of 13 bandpass filters plus 1 lowpass and 1 highpass filter, with an envelope follower per band producing 15 CV outputs that track the spectral envelope of the input signal.
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A-129/2 Vocoder Synthesizer
Synthesis section of the A-129 modular vocoder. Takes a carrier signal through a bank of 15 bandpass/lowpass/highpass filters, each with a VCA controlled by CV inputs from the A-129/1 analysis section, producing the classic vocoder effect. Can also be used as a standalone voltage-controlled filter bank.