Think it was hard to get Led Zeppelin back together? Try “Rock Band” and “Guitar Hero 3,” the two music simulation vidgames that came out this year.PlayStation 3 owners are fuming because they can’t use the guitar controller from “GH 3” in “Rock Band” for an extra band member, even though it works the other way around. “Rock Band” developer Harmonix says it has come out with a patch to make the two compatible, but Sony, which controls PS3 downloads, says “GH 3” publisher Activision asked it not to distribute the patch. An Activision rep says the company might change its mind — for a price. “We believe we should be compensated for the use of our technology,” she told the Boston Globe.