ADDAC 106 Eurorack Quad Noise Percussion Module

A straight forward 4 voice module with frequency and decay controls for each of the voices. As the name already unveils we added a noise source and created 2 different circuits that explores 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 applied post-vca.

At each voice input there’s a switch which 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 it’s fixed threshold.
2. Mute – This disconnects then 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.

Trigger mode is mostly dedicated for percussive sounds while the Envelope mode is open to any external enve- lope 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 results of using this method had us all extremely surprised, so please 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 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 which is closer to a Hat timbre.
All of these 3 voices are also differently tuned from each other to offer more timbrical options.
Voice 4 is closer to a typical t-networks circuit but this time 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, Hat/Snare (Voice 1 to 3)
• Frequency Range Switch, Low/Mod/High (Voice 4) Input
• Audio Output

Specifications
Width: 8hp
Depth: 40mm
Power: 40mA +12V, 40mA -12V

Manufacturer product page here.
Product manual here.