ADDAC Systems - 106 T-Noiseworks

The final module in ADDAC's T-Networks series, a straightforward 4-voice module with frequency and decay controls for each voice. As the name already unveils, a noise source has been added along with 2 different circuits that explore the timbre of a t-network when used to filter noise.

There are 2 different circuits in this module: voices 1 to 3 have a pre-VCA t-network filter while in voice 4 the t-networks filter is applied post-VCA.

At each voice input there's a switch that sets which type of input to use; this signal will be used to control an internal VCA hence why the type of setting defined here is important:

1. Trigger - Any incoming CV will be converted into a 1ms trigger as soon as it crosses its fixed threshold.
2. Mute - This disconnects the incoming signal, effectively muting the voice.
3. 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.

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 also welcome use as a Trigger/Envelope input—in fact the results of using this method can be extremely surprising, so do try it out!

Differences between voices:

The first 3 voices also feature a Timbre selector switch: Hat/Snare. In Snare mode all frequencies coming from the t-networks filter pass through 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 which is closer to a Hat timbre. All of these 3 voices are also differently tuned from each other to offer more timbral options.

Voice 4 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.

Hat and Snare are terms used very loosely here; they are timbral references and do not in any shape or form try to effectively replicate the complex timbres of a real world Hat or Snare.

Features:

• 4 Voices each with:
• Frequency control
• Decay control
• Timbre type, Hat/Snare (Voice 1 to 3)
• Frequency Range Switch, Low/Mod/High (Voice 4)
• Input
• Audio Output
• Overall Summing Mix output with Volume control and 2 different output types (Normal/Dirt)