A-104 Trautonium Formant Filter

Doepfer A-104

Module A-104 is one component of Doepfer's trifecta of Mixtur Trautonium modules, which include the A-113 subharmonic generator and A-198 ribbon controller. Together, these modules for a eurorack incarnation of the legendary Mixtur Trautonium.

A-104 holds its own outside of the above configuration. It can be used with any modular level audio signal for a variety of unique responses. It is comprised of four parallel resonance filters, each able to be switch from low-pass to bandpass (or shut off entirely). Its audio outputs are sensitive enough to yield distortion for entirely new sounds. Whether used with its sister Trautonium modules or entirely separately, Module A-104 is one of the most versatile sound modifiers in the world of eurorack.

A-104 Features

• Four parallel resonance filters
• Filter frequency ranges from 50Hz to 5kHz
• Separate controls for frequency, resonance, and level for each filter
• Can be used in tandem with modules A-113 and A-198 to replicate functionality of the original Mixtur Trautonium