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​gregsbrain LLC is a new modular company based in Portland, Oregon currently shipping our first commercial Eurorack module. xVox is a four-voice real-time pitch shifter. The module is 17HP wide with a 1.5-inch diagonal 128x128 pixel RGB OLED display. There are color-coded volt-per-octave and trigger inputs for each of the four voices. 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, there are also a few assembled modules currently 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 effects.

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

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

Download File

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

Download File

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The first batch of xVox DIY kits (and a few assembled modules) are now available at Patchwerks.com.

www.patchwerks.com/collections/kits-and-diy/products/gregsbrain-xvox-harmonic-pitch-shifter-kit
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It is a fairly easy all through-hole build. These are the build instructions. 
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xvox_build_guide.pdf
File Size:	1441 kb
File Type:	pdf

Download File

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This is the complete kit.

This is the link to the VCV Rack plugin library.vcvrack.com/gregsbrain/xVox

Below is a download link for some VCV Rack patches to get started with:

rand1.vcv produces a 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 voice.
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xvox-vcv-rack-patches.zip
File Size:	4 kb
File Type:	zip

Download File

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