Doepfer A-111-4 quad precision oscillator

Doepfer A-111-4 quad precision oscillator.

Bought new from Schneidersladen in July 2024. Perfect working order.
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Four-pack of precision oscillators – You want to create chords, fat unison sounds, wafting drones or paraphonic respectively fully polyphonic sounds with your modular system? – Meet the A-111-4! The module contains four well-equipped VCOs with a wide frequency range. Their pitch tracking is extremely accurate. Waves produced by the A-111-4 draw very close to the ideal form. The module’s sound is beefy. Thanks to two kinds of sync functions and modulation inputs, it is possible to flexibly twist the raw waveforms. – A great all-rounder!

The oscillators of the A-111-4 feature a triangle core design based on the CEM3340. Their frequency range extends to more than ten octaves. Each VCO comes equipped with a 1v/octave input, meaning it is possible to play the circuits individually. As a result, musicians can create polyphonic patches or generate several, completely independent sounds with the A-111-4. A fifth 1v/octave input allows users to play all oscillators at once or add transpositions. With detuning some of the VCOs via their three-way octave switches and tune potentiometers, it is possible to generate wafting drones, chords and unison sounds. Jumpers on the circuit board can be utilized to alter the range of the tune knobs. In detail, a range of two semitones, one octave or four octaves can be chosen. Additionally, a global octave switch and a global tune potentiometer were implemented.

On the output side there is a triangle, saw-tooth and pulse output per VCO. Additionally, the A-111-4 features three mix outputs. CV inputs plus attenuators allow users to modulate the frequency (linear or exponential) respectively the pulse width of each oscillator. On top of that, there is a sync input per VCO. Jumpers make it possible to choose between hard and soft sync.

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Eurorack
Modular synth