CVpal, a cheap and cheerful USB to CV/Gate interface. Original developer: Emilie Gillet (emilie.o.gillet@gmail.com) The firmware is released under a GPL3.0 license. It uses Objective Development's V-USB virtual USB library. The PCB layouts and schematics (in cvpal/hardware_design/pcb) are released under a Creative Commons cc-by-sa 3.0 license.