"The best way to get 8-bit sounds is to employ a real NES system or Game Boy for fifteen bucks and go to town — nothing else sounds quite the same. But for the next best thing, and the ability to do evil things to those sounds within a serious host, this free plug-in from Japan that will do the job"Title link takes you to the post on CDM. Here's a link to the official site's download page in Japanese.
