^ this is sort of why nitro pulled the roms off his site. too many people ran into issues getting it to work with multiple copies at once via arduinoboy... they are still handy though if you have gear which doesn't allow you to change MIDI channels.. i had a synth that was locked to channel 1, so i've used the 11-15 version of the rom for almost everything.. honestly can't even remember if i ever got around to testing 3 copies using the nanoloop usb midi adapter, mostly because it would have been only a test, if i want to use more than 1 game boy for music at a time, i prefer syncing multiple copies of nanoloop personally (like the track i made using 6 game boys)
You are talking about three topics here. I don't really know the situation about the nitro2k01 ROMs stability or take-down reason but it is weird that he deleted those files only because "people ran into issues". Also, I expect to use near 12 MIDI channels with live instruments, so there is no option of using only one Game Boy or syncing tracks because there are no LSDJ/Nanoloop/DAW music tracks, only realtime MIDI signals.
And just for the record. I expect to spend time improving, trying-to-fix and making mGB 'live performance reliable', as it seems the best one for DMG Game Boy (compared with modded Pushpin). Because I really want to use real chiptune hardware in live concerts. Especially when nearly all the tools we need for this set are open-sourced, as mGB and Arduinoboy. That's why I want to catch up with all the available information of the already available compiled/used/modded tools. And I thank you for all the info you are all showing here.