Q: Is it possible to sync together more gameboys by
using a 4 way link cable and setting one gameboy to master and then
the rest to slave?
A: The 4-way cable doesn't work. But it's possible to sync multiple Game Boys by splitting and splicing regular
Game Link cables.
This is a 6-way LSDJ or nanoloop sync-box i made :
Q: Who made this 6-way LSDJ/Nanoloop sync box and what can I do to purchase one?
A: Was made by Delfy
http://www.myspace.com/delfycreations
Was custom made for Calbee (and now property of environmental sound collapse), so as far as ordering one goes, you'd have to contact Delfy and see if he'll make another.
Q: Is there a tutorial available for one who knows nothing about splicing gameboy link cables or any cable in general? If not, can anyone make one?