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xVox is an effects module for Eurorack that turns a single oscillator input into a four-note polyphonic voice. It does this by shifting the pitch of the input four times and applying filters and envelope generators to shape the sound. It does this in real-time so changes in the audio input have an immediate effect on the audio at the outputs. 

The core of xVox is a four voice pitch shifter. A pitch shifter changes the musical pitch of an audio signal. In other words, it moves a musical note up or down without changing the tone. Importantly, the ratios of the harmonics that make up the audio signal are preserved so the pitch shifted audio sounds the same, just a higher or lower note. 

xVox is available now as a DIY kit and fully assembled.


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xVox features
Front panel
  • Two audio inputs, primary normalled to secondary.
  • Two audio outputs.
  • Four volt-per-octave and four gate/trigger inputs.
  • Four assignable CV sockets and two assignable knobs.
  • Push-button rotary encoder and two LED push buttons.
  • 1.5-inch 128×128 RGB OLED display.
Four voice polyphony
  • Pitch control over each channel depends on polyphony mode.
  • Individually triggered or triggered in unison.
  • Open tuning or quantization to scales, semitones, or octaves.
  • 7th chord pitch shift for root, 3rd, 5th, and 7th.
  • Chord progressions based on circle-of-fifths.
  • Supports an external USB MIDI controller
Envelope generator
  • AD (Attack/Decay) or ADSR (Attack/Decay/Sustain/Release)
  • Solo, unison, and strum trigger options or on note change.
  • Log, linear, and exponential attack, decay, and release curves.
  • Attack, decay, and release times from milliseconds to minutes.
Other functions
  • Vocoder cross-modulation effect
  • Sample and hold option when in drone mode.
  • Tuner with automatic tuning feature.
  • Filters (low-pass, high-pass, band, notch, and comb)
Color-coded visualizations
  • Piano keyboard showing notes as they are triggered.
  • Spectrum shows real-time harmonics of each voice.
Dimensions
  • 17HP wide, 32mm deep.
Power consumption
  • +12V 144mA (133mA with display dimmed)
  • -12V 8.4mA
  • +5V 0mA

All the sounds on this video, including the introduction and closing clips were made with just xVox and Mutable Instruments Plaits. There are no additional effects modules in the audio chain.
These is the lastest xVox quick start guide and the complete user manual.
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xVox 2.0 Quick start
File Size: 339 kb
File Type: pdf
Download File

xvox_user_manual.pdf
File Size: 2168 kb
File Type: pdf
Download File


xVox  Module


xVox DIY Kit


This is a detailed step by step build for the xVox kit.
xVox DIY Kit Build Guide
File Size: 1441 kb
File Type: pdf
Download File

These are all the parts in the complete DIY kit. These are all through-hole parts, and while a steady hand and a hot soldering iron are essential no great soldering skills are required. xVox can easily be assembled in an afternoon. If you get into trouble you can email [email protected] and we will try our best to resolve any problems you are having.
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If you want to "try before you buy" or prefer to work in the virtual world this is the link to the VCV Rack plugin library.vcvrack.com/gregsbrain/xVox

Here are download links for a few VCV Rack patches to get started with:

rand1.vcv produces quite musical random chord progression with some drop chords thrown in for a little variation.

midipoly4.vcv works with an external MIDI keyboard or other MIDI source and lets you play 4 note chords from a single oscillator.
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xvox-vcv-rack-patches.zip
File Size: 4 kb
File Type: zip
Download File

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