MegaDrum firmware:
MegaDrum STM32F103/STM32F205/Atmega644/1284 versions
Windows/Linux/Mac Software:
MegaDrum Manager-FX - control your MegaDrum from a computer
USB Firmware:
PIC18F2550/PIC18F2450 (for 4/8/12/16/20MHz crystals), PIC18F14K50/PIC18F13K50 USB MIDI firmware with support for 2 MIDI interfaces and switching to higher MIDI speeds:
Note that PIC18F14K50 and PIC18F13K50 are not pin compatible with PIC18F2550 and require a proper programmer to be loaded with firmware.