I’ve had the privilege of getting access to trash80’s mGB code, which of course has given me the opportunity to make improvements. My first improvement is to add support for extended MIDI channels. (1-5,6-10 or 11-15 depending on which ROM you’re using.) This is useful for people who want to use mGB on the same MIDI output as MIDINES, other synths or perhaps use 3 copies of mGB simultaneously with one Arduinoboy. (With three link cable plugs).