MATRIXSYNTH: DSP Synthesizers USB-MIDI2CV - "The most simple MIDI to CV interface"
Arturia Beatstep USB, MIDI, and CV Controller and Sequencer
DIY USB MIDI to CV - Hackster.io
Amazon.com: Arturia BeatStep Pad Controller and CV/Gate Sequencer USB/MIDI/ CV Controller and 16-Step Sequencer with V-Moda Forza in-Ear Headphones and Gravity Magnet Phone Holder Bundle : Musical Instruments
Intellijel µMIDI Tutorial 1 - MIDI to CV - YouTube