From what I have heard about the ZX 500, it is integrated in with the TV set, and therefore channels are tuned by the ZX 500 and NOT the TV. IF this IS the case, you are basically SOL with that unit. My 08 has a Concertone ZX 600, which has a DVD/CD-AM/FM 5 speaker surround sound w/subwoofer, and the 22 inch digital HDTV made by VENTURER is separately controlled for the most part from the Concertone. The sound and the DVD signals are sent to the TV via video and audio in jacks in the back of the TV. They both have separate remotes, and are both 12 volt powered, which is great for watching TV while "boondocking"! About the only thing you can do is get a TV digital converter, and you can still watch TV that way, providing it's a 120v TV set.
Hope this answers your questions, and GOOD LUCK!
/SIGPIC]'08 V-lite Flagstaff 30WRLS
'06 Ram 1500 QC hemi
Reese dual cam sway control,
K&N series 77 intake, Hellwig helper spgs. LT tires,
Flowmaster "true duals", 380 h.p., Bilstein shocks