By Mac Randall Remember back in the spring, when we reported on the Roland Corporation’s 50th anniversary and hinted that there would be multiple products launched this year in celebration? Well, that has indeed come to pass, with the debut of history-acknowledging effects units like the BOSS RE-2 and RE-202 Space Echo (repackaging a 1970s classic in foot-pedal form) and synthesizers like the JUNO-X (an update of an ’80s favorite). Now the folks at Roland have taken anniversary mania to what may be its peak level, announcing three very exclusive new releases: an electronic drum kit, an electro…