Convert your DMG-07 to a 1x3 Game Boy Sync Box.
I'll be adding this tutorial to my website but for now it comes to you in flickr format!
it's super easy and anyone should be able to do it.
i'll be doing a video for this asap.
enjoy!
http://www.flickr.com/photos/lameboymus 419956111/
Add this + a GB Midi sync device and you have a lot of gameboys syncing up via midi! :-D
If you do this mod. please post your results here.. i'd love to hear stories of success..
And be sure to let me know if i didn't make anything clear.
thanks!