Apparently, when the original Star Wars movie was shown in cinemas during the late seventies, filmmaker George Lucas was unhappy with its sound and picture quality. He set-up THX which specialises in high quality post-production work so that a film's sound and picture standard is of the highest calibre. It's not just films that can be 'THX certified' - the company also specifies exacting standards for cinema construction, professional equipment and home AV components, too. Incidentally, the name THX is derived from THX 1138, the first film Lucas made while he was a student in 1971. It starred Robert Duvall as a robot called THX 1138 and there have been many direct and subtle references to the title in other George Lucas films: it was the number plate of Harrison Ford's roadster in American Graffiti and the numbers are also mentioned in the Star Wars and Indiana Jones films. The initials stand for Tomlinson Holman's eXperiment - Tom Holman is now a professor at the University of Southern California and widely respected as a film audio pioneer and a lead developer of the THX system (for which he won an Academy Award in 2001).
Time Slip
Lets you watch one recorded programme while recording another at the same time. Chase Play is an associated feature which lets you watch a recording that has already started while continuing to record.