Sinfonio by Audiophile Circuits League Ready for Pre-Order

  • By: Thorsten Meyer
  • Date: Friday, 21 June 2019
  • Time to read: 3 min.

Unleash the power of your modular system with the Sinfonion. Not only is the Sinfonion the most complex and versatile quantizer, chord generator and arpeggiator in Eurorack format, it is also a very musical module and fun to use. It has been designed and programmed by Mathias Kettner and is produced by Audiophile Circuits League in Berlin.

The Sinfonion is designed for those musicians that do not want to be limited to creating “sound sculptures” or rhythmic grooves with their modular instruments but want all their fabulous VCOs and other voices to play together in the most musical and polyphonic way – may it be harmonic or even disharmonic on purpose. The Sinfonion comprises of three independent quantizer channels, a four-note chord generator, an arpeggiator and a complex progression sequencer in one. Thanks to a vast array of buttons and knobs placed around a sharp OLED display, it is easy to use and come up with musical ideas.

Sinfonion a control center of your modular system

With a total of 8 pitch outputs, 4 gate outputs, 11 CV inputs, and 9 gate inputs, it offers a large number of controls. Its plethora of buttons makes it an actual instrument you can play. Furthermore, the Sinfonion features an expansion port to add modules and expand functionality in the future. The three quantizer channels provide direct access to harmonic scale notes via dedicated buttons per channel (Root, 3rd, 5th, 7th, 9th, 11th, 13th). The buttons are made for jamming, controlling the sequences on the go. A fast processor allows quantization times below 1ms.

Chord, Sequencer & Arpeggiator

A chord section generates four pitch outputs, allowing to create four-voiced chords. It offers a lot of options directly accessible from the front panel. Thanks to dedicated knobs for pitch and spread, buttons for selecting the notes chord inversion and optional slew, you can get the chord you are looking for in no time. The arpeggiator section features 8 different patterns, dedicated knobs for pitch and range, and an array of buttons for selecting the scale notes and the pattern (Up, Down, Up/Down, Down/Up, Baroque, Octaves, Brownian, Random).


Eight different basic patterns
Dedicated knobs for pitch and range
Buttons for selecting scale notes
Buttons for selecting the pattern and start note

Chord Progression Sequencer
  • 16 songs with 4 parts each and 32 steps (chord changes) per part
  • Chord progression via clock, button, gate or CV
  • Sequencing of chord voicings, octave switches and scale note selections

All these sections are under control of the Chord Progression Sequencer. It is the brain of the Sinfonion and is operated easily thanks to the display. You can change the root, degree, and mode by simply turning the according to knobs. It enables the creation of 16 songs with 4 parts each, and 32 steps per part. This comprises the sequencing of chord voicings, octave switches, and scale note selections.

Chord Generator

  • Four pitch outputs to be used for four-voiced chords and other stuff
  • Dedicated knobs for pitch and spread
  • Buttons for chord inversion and optional slew (portamento)
  • Buttons for selecting interval functions for the chord, 98 different voicings

Sinfonion Features

  • 52 large buttons, 12 small buttons, 12 knobs, 32 jacks
  • An OLED display with a resolution of 128 x 64 pixels
  • 8 pitch outputs, 4 gate outputs, 11 CV inputs, 9 gate inputs
  • STM32F446 MCU running at 180 MHz
  • 8 highly accurate low jitter 16-bit DACs scaled to an output range from -2 V to +8 V
  • 16 highly accurate low jitter 16-bit ADCs covering a range from -10.24 V to +10.24 V
  • Expansion port for future expansion modules and for firmware upgrade
  • 88 built-in base scales, editable by adding and removing notes
  • 7 dedicated CV inputs
  • 4 general purpose CV inputs with 28 different assignable functions
  • 2 general purpose gate inputs with 20 different assignable functions
  • 2 general purpose gate outputs with 14 different assignable functions
  • 2 general purpose pots with 28 assignable functions
  • Harmonic Link: connect any number of Sinfonions in order to form a distributed “Super Sinfonion”
  • Bultin mixing/routing matrix for pitch inputs and outputs
  • No load/save necessary – everything is automatically saved

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