A how-to on making a DIY USB MIDI to CV from DIY Synthesizer:
This one is simple and does not require any expensive Teensy’s or STM32.
It runs on the ATtiny85 using V-USB.
The ATtiny is programmed with the Micronucleus bootloader and is firmware
More details at DIY Synthesizer homepage.
from Dangerous Prototypes http://ift.tt/2iKgkVI