Do you still see movies in movie theaters? If you do, or if you remember doing that, then you'll remember the THX logo and its accompanying audio, a vaguely threatening crescendo that kicks off the proceedings. THX, which is essentially an audio certification system, has been running the same version of that video and audio clip (with occasional tweaks) for more than 30 years. It first debuted in 1983, along with "Return of the Jedi." Now the company is updating the audio component, which it calls "Deep Note," for the 2,000+ THX theaters worldwide