In 2005, aspiring rock gods around the world lived out their fantasies with the Harmonix video game "Guitar Hero," which allowed everymen to throw it down like Eddie Van Halen -- even if they didn't know the difference between a fret and a bridge. That craze has passed, but two of the game's creators, plus an Activision vet and advertising production company exec, are now hoping to bring the average Joe's pop star dreams to life with home singing system Singtrix.The next-gen karaoke system is an aspiring American Idol's dream, promising to make you sound better than you do, whether you're t...