Modified firmware for CVpal, a cheap and cheerful USB to CV/Gate interface.

An additional CVpal mode is included in order to faciliate easy interfacing with the x0x-heart Eurorack format synthesizer module (http://www.openmusiclabs.com/projects/x0x-heart/).

The x0x-heart mode is now Channel 8, which was originally MonoCV/Gate with CC conversion of CC02. Additionally, the USB device name is now 'X0Xpal' rather than 'cvpal', in order to allow operation alongside other non-modified cvpal units on the same computer.

Channel 8 Outputs, Mono CV and Gate and Accent and Slide:

OUT 1: Note CV
OUT 2: 'Accent' gate, goes high when note velocity is greater than or equal to 100
GATE 1: Gate
GATE 2: 'Slide' gate, goes high when played or sequenced notes overlap

Original developer: Olivier Gillet (ol.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.