Ok, I've been doing furious googling/searching on this topic and I can't really find a definitive answer other than Tim's undocumented DMG07 Arduinoboy hack, so I'm going to ask: what will it take for me to get multiple Gameboys synchronized to the same DAW (preferably Ableton)? Nothing fancy like different sync modes per Gameboy, just the same signal from the DAW to multiple Gameboys so they can all follow the same clock.
So far I've kind of been attached to the idea of just making a normal Teensyboy (with katsumbhong's help) and then using a modded DMG07 instead of a link cable to send MIDI through. In my head it works because the DMG07 just allows clock messages to go to multiple Gameboys, but in my case it wouldn't be a master LSDJ sending those messages -- it would be a DAW. Unfortunately I have absolutely no idea if that would work in practice, because I'm not really 100% clear on how MIDI works in general.
But I'm not totally attached to the idea of the Teensyboy -- if it worked, I would be open to just splicing a MIDI cable to a DMG07 or something; I was originally talking to the guy who runs Xiwi Electronics to see if I could do that with one of his Arduinoboys, but I couldn't get a definitive answer on it so I didn't go for it. Basically, any help with this is appreciated!