The Doepfer A-110 Standard VCO is a generator module for modular synthesizers in the A-100 series. It outputs saw, pulse, triangle, and sine waveforms simultaneously. Octave switching and ±1 semitone fine tuning set pitch range. Manual and CV-controlled pulse width modulation are available. A Sync input allows hard-syncing to another VCO. It lacks FM, LFO-range operation, and tuning beyond ±1 semitone.
The Doepfer A-120 is a Eurorack filter module built to replicate the Moog 24dB low pass filter. Five potentiometers control cutoff, resonance, input level, and two CV amplitudes. Three CV inputs allow layered, complex modulation. It delivers Moog-like saturation and character at low cost. It offers no multimode filtering, no self-oscillation feedback control, and no visual indicators for resonance peak or clipping. Use it for warm, resonant, hands-on low-pass filtering in modular systems. Avoid it if you need versatility beyond 24dB low pass.
The Doepfer A-140 ADSR is a basic ADSR envelope generator for the A-100 modular system. It has no published specs. It has no CV inputs. It has no visual indicators. It does one job, simply.
The Doepfer Dark Time is an analogue sequencer released in 2010. It has no sound module. It controls external gear via CV/Gate, MIDI, and USB. It sequences either 16 steps on one channel or 8 steps across two channels. Real-time knob control covers transposition, note skipping, and playback alternation. Firmware 1.10 resolves bugs present in earlier versions.
The Doepfer A-100 is an analog modular synthesizer system introduced in 1995. It uses 3U-height, 2HP-width modules patched with 3.5 mm leads. It established the Eurorack standard adopted by many manufacturers. It enables emulation of the Trautonium and Theremin using specific modules.
Eurorack is a modular synthesizer format introduced in 1995 by Doepfer Musikelektronik. It defines mechanical, electrical and interconnection standards so modules from different makers fit the same cases and communicate reliably. It has no built-in keyboard, sequencer or interface. It demands manual patching and physical organisation. It supports deep signal routing and long-term system expansion. It is used by musicians and designers to build custom synthesis environments.
A compact, monophonic, fully analog synthesizer released in 2010 as a stand-alone version of the Doepfer A-111-5 Eurorack module. It features dual LFOs capable of audio-rate FM (~5 kHz), a 24 dB/octave low-pass VCF, and a triangle-based VCO. The VCF can function as a sine oscillator when the VCO is disengaged and resonance is maxed. All sound generation and modulation are analog; only USB/MIDI contain digital components. It has no polyphony, no patch memory, no velocity or aftertouch, and no audio input. Superseded by the Dark Energy II in 2012.