Unique and innovative Eurorack Modules
gregsbrain LLC is a boutique modular synthesizer company based in Portland, Oregon. Our focus is innovative digital Eurorack modules operating on waveform analysis and synthesis in the frequency domain.
We will be at the Portland Synth & Pedal Expo this weekend (April 11th and 12th). This is the link for the show:
Portland Synth & Pedal Expo 2026 – Delicious Audio Events
In celebration we are offering a 10% discount on our kits and modules through April 16th.
Use this link when placing your order and the discount will be automatically applied
Synth & Pedal Expo 2026 promo
Our first product, xVox which lets you get get four voice polyphony out of the oscillators already in your rack has just had a major update. xVox firmware version 2.0 has a completely new envelope generator, a new set of filter options including a comb filter and now supports USB MIDI.
We are offering xVox as a DIY kit and occasionally a few hand-assembled modules.
There is also new firmware for dSpec our direct spectral synthesis dual VCO. Version 1.4 has much faster pitch tracking and the improved audio frequency modulation.
dSpec is available fully assembled but we also have parts for kits. Let us know if you are interested.
Our modules are also available free VCV Rack plug-ins.
We will be at the Portland Synth & Pedal Expo this weekend (April 11th and 12th). This is the link for the show:
Portland Synth & Pedal Expo 2026 – Delicious Audio Events
In celebration we are offering a 10% discount on our kits and modules through April 16th.
Use this link when placing your order and the discount will be automatically applied
Synth & Pedal Expo 2026 promo
Our first product, xVox which lets you get get four voice polyphony out of the oscillators already in your rack has just had a major update. xVox firmware version 2.0 has a completely new envelope generator, a new set of filter options including a comb filter and now supports USB MIDI.
We are offering xVox as a DIY kit and occasionally a few hand-assembled modules.
There is also new firmware for dSpec our direct spectral synthesis dual VCO. Version 1.4 has much faster pitch tracking and the improved audio frequency modulation.
dSpec is available fully assembled but we also have parts for kits. Let us know if you are interested.
Our modules are also available free VCV Rack plug-ins.