Just got another call from Yamaha. It seems the upgrade requires a high-tech tool to install the chip. Nobody here has it. The unit has to be sent to Yamaha in California for upgrade.
They offered to pay all costs and rush it through for me. I would still be looking at a couple of weeks, if nothing went wrong.
I will probably not get the upgrade done, since it really doesn't address anything I use anyway. (The vocal harmonizer settings).
DonM