For Uncle Doug (who seems to want to keep this pot on the boil ;>)):
Technics operating systems are not written in stone. Why do you think that Technics, Yamaha, and others sell instruments which have their operating systems written onto an (wait for it!) Electrically Erasable Programmable Read Only Memory (EEPROM or, in current jargon Flash EPROM). The whole idea is that, given reasonable precautions, the user can upgrade the system whenever it is corrected/improved. Remember, your Technics keyboard is, basically, a musical computer, run by a computer program. I have been in the computer world for more years than I care to remember, but one tenet still holds good "computer programs are never finished, they are said to be at an advanced state of completion". Some owners will ignore all the above and never upgrade their instruments, unless they can get their dealer to do it for them - which goes against the original reason to EEPROMs. If you don't mind running slightly lame equipment, OK
Great-Grandpa Mike