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​gregsbrain LLC is a modular synthesizer company based in Portland, Oregon. We are currently shipping our first commercial Eurorack module xVox, a four-voice real-time pitch shifter effects module. xVox is 17HP wide with a 1.5-inch diagonal 128x128 pixel RGB OLED display. Color-coded volt-per-octave and trigger inputs controle ach of the four pitch-shifted outputs. Six CV inputs, two of which are knobs, can be assigned to perform various modulation functions. xVox is available as a DIY kit and as a VCV Rack plugin. From time to time there may also be some fully assembled modules available.

xVox features
Front panel

• 2 audio inputs, primary normalled to secondary.
• Stereo audio output.
• 4 VPO and 4 gate/trigger inputs.
• 4 assignable CV sockets and 2 assignable knobs.
• Pushbutton rotary encoder and two LED push buttons.
• 1.5-inch 128x128 RGB OLED display.

Four voice channels

• Pitch control over each channel depends on pitch-shift mode.
• Individually triggered or triggered in unison.

Three pitch shift modes

• 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.

Envelope generator

• Attack/Decay, ADSR, or OFF
• Solo, unison, or strum trigger options or on note change.
• Selectable attack and decay curves
• Attack and decay times from several milliseconds to minutes

Other functions

• Sample and hold option when not using envelope generator.
• Tuner with automatic tuning feature.
• Filter with controls for HP, LP, and slope.
• Audio input and output level controls with soft-clipping and AGC.

Color-coded visualizations

• Piano keyboard shows 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​

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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.

This is the lastest xVox quick start guide and the complete user manual.

xvox_quick_start.pdf
File Size:	338 kb
File Type:	pdf

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xvox_user_manual.pdf
File Size:	934 kb
File Type:	pdf

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xvox_build_guide.pdf
File Size:	1441 kb
File Type:	pdf

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These are all the parts in the complete kit. They are all through-hole parts, and while a steady hand and a hot soldering iron are essential no great soldering 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.

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

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