Ken, there are significant functional differences between the two software versions. DD-EX and DTS-ES were added as well as a much better remote. I don't think the upgrade will cost $400, though. It was $100 initially, and approx $250(?)later. The later/ current price I am unsure of.
The best source of Lexicon info is on the SMR-Lexicon forum. Link Below. Best Regards, Aaron
http://www.smr-forums.com/lexicon.html
The best source of Lexicon info is on the SMR-Lexicon forum. Link Below. Best Regards, Aaron
http://www.smr-forums.com/lexicon.html