Doepfer A-100

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A Doepfer A-100 in a P6 suitcase enclosure
Example piece of music performed entirely on a Doepfer A-100

The Doepfer A-100 is an analog modular synthesizer system introduced by German audio manufacturer Doepfer in 1995. Although it only had 10 modules at time of release,[1] it currently has more than 120 modules[2] plus several different enclosures and accessories.

A-100 modules are designed to be rackmounted, each being 3U tall and a multiple of 2HP wide, although a variety of cases are available to house them. This type of racking system is called 'Eurorack' and has been adopted by many other manufacturers of synthesiser modules. Modules are patched using standard mono miniature (3.5 mm) leads. This combination of 3U height, multiples of 2HP width, and 3.5 mm leads is known more generally as the Eurorack standard, and is in contrast to the older combination of 5U height and 6.35 mm leads pioneered by Moog. Other companies such as Analogue Solutions, Analogue Systems and Cwejman have also adopted the Eurorack standard, making it relatively easy to integrate their modules into each other's systems.

Using certain modules designed specifically for the purpose, it is possible to use the A-100 system to emulate a Trautonium or a Theremin, as well as to use it as a vocoder.[3]

Modules[edit]

The following modules have been, or are still being, manufactured by Doepfer:[4]

  • A-101-1 – Vactrol multimode filter
  • A-101-2 – Vactrol low-pass filter / VCA
  • A-101-3 – 12 stage vactrol phaser
  • A-101-9 – Dual universal vactrol module
  • A-102EMS VCS 3 style 18 dB/octave diode low-pass filter
  • A-103Roland TB-303 style 18 dB/octave transistor ladder low-pass filter
  • A-104Trautonium style formant filter
  • A-105 – 24 dB/octave SSM2044 based 24 dB/octave low-pass filter
  • A-106-1Korg MS-20 style 12 dB/octave low-pass / 6 dB/octave high-pass filter
  • A-106-5Oberheim SEM style 12 dB/octave multimode filter
  • A-106-6Oberheim Xpander style multimode filter
  • A-107Oberheim Xpander style multimode filter
  • A-108 – 6, 12, 24, and 48 dB/octave low-pass / band-pass transistor ladder filter
  • A-109 – Signal processor
  • A-110 – Standard VCO
  • A-111 – High end VCO
  • A-111-5 – Mini synthesizer voice (combination VCO / filter / VCA / LFO / ADSR envelope generator)
  • A-112Sampler / wavetable oscillator
  • A-113 – Trautonium style subharmonic generator
  • A-114 – Dual ring modulator
  • A-115 – Audio divider
  • A-116 – Waveform processor
  • A-117 – Digital noise generator / Roland TR-808 style discordant sound source
  • A-118 – Analog noise generator / random voltage
  • A-119 – External input / envelope follower
  • A-120Moog style 24 dB/octave low-pass filter
  • A-121 – 12 dB/octave multimode filter
  • A-122Oberheim style 24 dB/octave low-pass filter with CEM 3379 chip
  • A-123 – 24 dB/octave high-pass filter
  • A-124EDP Wasp style 12 dB/octave multimode filter
  • A-125Phaser
  • A-126 – Frequency shifter
  • A-127 – Triple resonance filter
  • A-128 – Fixed filter bank
  • A-129/1Vocoder analysis
  • A-129/2 – Vocoder synthesis
  • A-129/3 – Vocoder slew limiter
  • A-129/4 – Slew limiter controller
  • A-129/5 – Voiced/unvoiced detector
  • A-130 – Linear VCA
  • A-131 – Exponential VCA
  • A-132-1 – Dual linear low cost VCA
  • A-132-2 – Quad VCA
  • A-132-3 – Dual linear / exponential VCA
  • A-132-4 – Quad exponential VCA / mixer
  • A-133 – Dual polarizer
  • A-134-1Panner
  • A-134-2 – Dual crossfader
  • A-135 – Mixer
  • A-136 – Distortion / waveshaper
  • A-137-1 – Wave multiplier I
  • A-137-2 – Wave multiplier II
  • A-138A – Linear mixer
  • A-138B – Exponential mixer
  • A-138C – Polarizing mixer
  • A-138D – Crossfader / effect insert
  • A-138E – Quad three-way crossfader / mixer / polarizer
  • A-138X – Mixer expander (for use with A-138A or A-138B)
  • A-138M – 4x4 matrix mixer
  • A-139Headphone amplifier
  • A-140ADSR envelope generator
  • A-141 – Voltage controlled ADSR envelope generator
  • A-142 – Decay envelope generator / gate
  • A-143-1 – Complex envelope generator / quad AD envelope generator / quad LFO
  • A-143-2 – Quad ADSR envelope generator
  • A-143-3 – Quad LFO
  • A-143-9Quadrature LFO
  • A-144 – Morphing controller
  • A-145LFO I
  • A-146 – LFO II
  • A-147 – Voltage controlled LFO
  • A-148 – Dual sample and hold / track and hold
  • A-149-1Buchla 200 style quantized random voltages / stored random voltages
  • A-149-2 – Eight digital random voltages
  • A-150 – Dual voltage controlled switch
  • A-151 – Quad sequential switch
  • A-152 – Addressed track and hold / analog shift register / octal switch (multiplexer)
  • A-154 – Sequencer controller
  • A-155 – Analog / trigger sequencer
  • A-156 – Dual quantizer
  • A-160 – Clock divider
  • A-161 – Clock sequencer
  • A-162 – Dual trigger delay
  • A-163 – Frequency divider
  • A-164-1 – Manual gate
  • A-165 – Dual trigger inverter
  • A-166 – Dual logic gate
  • A-167 – Analog comparator / subtractor / offset generator
  • A-170 – Dual slew limiter
  • A-171 – Voltage controlled slew limiter
  • A-172 – Maximum / minimum selector
  • A-174-1Joystick
  • A-174-2 – Wheels
  • A-175 – Dual voltage inverter
  • A-176 – Manual control voltage source
  • A-177-1 – Foot controller I
  • A-177-2 – Foot controller II
  • A-178Theremin style antenna
  • A-179 – Light controlled voltage source
  • A-180 – Multiples I
  • A-181 – Multiples II
  • A-182 – Switched multiples
  • A-183-1 – Dual attenuator
  • A-183-2 – Offset generator / attenuator / polarizer
  • A-183-3 – Amplifier
  • A-185-1 – Bus access
  • A-185-2 – Precision adder
  • A-186 – Gate/trigger combiner
  • A-187-1DSP effects
  • A-188-1BBD
  • A-188-2 – Tapped BBD
  • A-189-1 – Bit modifier
  • A-190-1 – MIDI to CV/gate/sync interface
  • A-190-2 – MIDI to CV/gate interface
  • A-190-3 – USB/MIDI to CV/gate interface
  • A-191 – MIDI to CV interface / shephard generator
  • A-192 – CV to MIDI interface
  • A-196Phase-locked loop
  • A-197-1VU meter
  • A-197-2 – LCD oscilloscope
  • A-198 – Trautonium style ribbon controller
  • A-199Spring reverb

Notable users[edit]

References[edit]

External links[edit]