Four-Voice Eurorack Module

ADDAC System 106 T-NOISEWORKS has frequency and decay control for each voice      01/04/20

Four-Voice Eurorack Module

ADDAC System has announced the last synthesizer module in its T-Networks series, 106 T-NOISEWORKS. The new Eurorack module features a straightforward 4-voice module with frequency and decay controls for each voice. In addition to these voices ADDAC System has included an additional noise source in the design, and created two different circuits that explore the timbre of a T-Network when used to filter noise. Here's what they have to say about it...

With two different circuits in this module, voices (1) to (3) have a pre-VCA T-Network filter, while on voice (4) the T-Networks filter is applied post-VCA. Further, at each voice input stage, there is a switch that controls which type of input to use. Since this signal is used to control an internal VCA, the type of defined setting is important:

  • Trigger: Any incoming CV will be converted into a 1ms trigger as soon as it crosses its fixed threshold.
  • Mute: This disconnects the incoming signal, effectively muting the voice.
  • Envelopes: This can be used with CV sources as well as gate sources, and simply follows the input signal.


This incoming signal will then be processed by a slew circuit which adds a decay factor — allowing the user to set the “Tail” of each voice. The Trigger mode is mostly dedicated for percussive sounds, while the Envelope mode is open to any external envelope control and able to control noise swooshes, swirls, crackles and pops simply out of T-Networks filtered noise. Audio inputs are also welcomed to be used as a Trigger/Envelope input. In fact the sonic results of using this method can be very surprising!

Timbre selector
The first (3) voices feature a Timbre selector switch. In Snare mode all frequencies coming from the T-Networks filter pass thru to the output. In Hat mode, it adds a high pass circuit which removes the mid/bottom frequencies (characteristic of the snare strike) creating a higher spectrum output that is sonically closer to a Hat timbre. All of these (3) voices are also differently tuned from each other to offer more sonic options. Voice (4) meantime is closer to a typical T-Networks circuit, but this time a peculiar one where the noise is gated by the VCA and then sent through the T-Networks filter.

Features: (4) Voices, each with:

  • Frequency control, decay control, timbre type (voices 1 to 3) Frequency range switch, Low/Mod/High (Voice 4) Input
  • Audio Output
  • Also and overall Summing Mix output with Volume control and (2) different output types (Normal/Dirt)
  • Tech Specs: 4HP 4cm deep 40mA +12V 40mA -12V


Pricing and Availability:
Available mid-April for 160€. The 106 T NOISEWORKS module will also be available as a full DIY kit.

More information:


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