The simplest USB MIDI to CV interface that could possibly work.

CVpal

Do-it-yourself USB MIDI interface

Overview

We dreamt of a really simple DIY kit – so simple that it would allow beginners to enter the world of DIY with a big smile – and yet, interesting enough to be useful in any kind of Eurorack setup. That’s how the CVpal was born! The kit contains only 25 parts to solder; but is an incredibly useful tool allowing you to connect your computer or iPad/iPhone (with camera connection kit) to your modular system or (neo-)vintage analog equipment.

The CVpal features a large palette of control modes – monophonic with velocity and extra square oscillator, monophonic with clock outputs, duophonic, dual monophonic, or even quad trigger conversion! Its 12-bit DAC with an 8-point software calibration curve makes it more accurate than more expensive products.

A simple stand-alone case is also available for the CVpal – making it useful outside of the modular – with a stompbox or a desktop analog synth for example.

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Assembly instructions

Specifications

User manual

CVpal on Modular Grid

Olivier Gillet, Mutable instruments SARL 2011-2013. Except where otherwise noted, content on this site is licensed under a cc-by-sa 3.0 license.